Every symbol safety sign in your facility carries a specific meaning, a meaning that your employees, contractors, and visitors need to understand instantly. A misread sign or an unfamiliar symbol can lead to hesitation in a critical moment, and hesitation is where injuries happen. That's why getting safety signage right isn't just a regulatory checkbox, it's a direct line to preventing harm.
But here's the problem: OSHA and ANSI standards define multiple sign types, each with distinct colors, shapes, and symbol requirements. Knowing which sign goes where, and what each color actually communicates, takes more than a quick glance at a compliance manual. It takes a clear, organized breakdown of the system behind the signs.
That's exactly what this guide provides. Below, you'll find all 9 OSHA/ANSI safety sign types, their color meanings, and the symbols that define them. At Safety Decals, we design and produce these signs daily for manufacturers, construction firms, schools, and government facilities across the country, so we built this guide from the same expertise we bring to every label and decal we make. Whether you're auditing your current signage or starting from scratch, this is your reference point.
1. Custom OSHA and ANSI safety decals and labels
Custom safety decals give you the flexibility to apply OSHA and ANSI standards directly to your specific equipment, environment, and hazards. Rather than relying on a generic sign that approximates your situation, a custom decal delivers exact, targeted messaging for the precise risk your workers face. That specificity is what makes custom signage more effective than off-the-shelf options across most industrial and commercial settings.
What the symbol communicates
A custom symbol safety sign communicates the same core message as a standard sign, but it's tailored to your machinery, process, or facility layout. The symbols you choose, whether a hand caught in a pinch point, an electrical bolt, or a chemical hazard icon, directly reference the real hazard present at that exact location. Workers respond faster to signs that match what they're actually looking at, and that faster recognition reduces errors in critical moments.
Standard colors, shapes, and headers
Custom decals still follow the same ANSI Z535 color and format standards as pre-made signs. The header color and signal word, such as DANGER in red or CAUTION in yellow, must match the hazard severity level defined in the standard. Your symbols, text panels, and pictograms must align with ANSI Z535.4 layout specifications to remain compliant, even when the content is unique to your operation.
Skipping ANSI Z535 formatting on a custom decal doesn't make it custom, it makes it non-compliant.
Where to use it and examples
Custom decals work anywhere a standard sign doesn't accurately describe the hazard. Common applications include:
- Proprietary machinery with unique pinch points or crush zones
- Vehicles carrying custom load limits or specialized cargo
- Chemical mixing stations with specific concentration warnings
- Electrical panels, conveyor systems, and pressurized equipment requiring exact operational parameters
Compliance and ordering tips
When ordering custom safety decals, verify that your supplier uses ORAFOL or equivalent high-durability materials rated for your specific environment, whether that means outdoor UV exposure, chemical contact, or high-heat conditions. Always confirm that your final design includes the correct signal word, safety symbol, and message panel layout before printing.
Before finalizing any order, proof your design against the ANSI Z535 standard line by line. Catching a formatting error before production saves you from a reprint and keeps your facility ready for the next OSHA inspection.
2. Danger signs
Danger signs represent the highest severity level in the OSHA and ANSI Z535 classification system. If a hazard will cause death or serious injury if a worker does not take immediate action, a danger sign is the correct choice. No other sign type carries this level of urgency.
What the symbol communicates
A danger symbol safety sign tells your workers that exposure to the identified hazard will result in death or severe injury. The symbol reinforces the signal word by visually depicting the specific threat, making the warning clear even before someone reads the text panel.
Standard colors, shapes, and headers
Danger signs use a red header panel with white lettering that spells DANGER in bold type. The ANSI Z535 standard specifies a rectangular format with a red, black, and white color scheme across the label. The signal word panel must be clearly separated from the message panel below it.
Red is reserved exclusively for danger-level hazards under ANSI Z535. Using red on a lower-severity sign misrepresents the risk and creates a compliance problem.
Where to use it and examples
Use danger signs where immediate, life-threatening hazards are present and unavoidable contact is possible. Common placements include:
- High-voltage electrical panels and exposed wiring
- Confined spaces with oxygen-deficient or toxic atmospheres
- Moving machinery with exposed blades or crush points
- Areas with fall hazards exceeding fatal drop heights
Compliance and ordering tips
Your danger signs must meet ANSI Z535.4 for product safety labels or ANSI Z535.2 for facility signs. Confirm your decal material is rated for the specific environment, since a sign that fades or peels stops communicating the hazard entirely.
3. Warning signs
Warning signs occupy the second-highest severity level in the ANSI Z535 system, sitting directly below danger. They apply when a hazard could cause death or serious injury if a worker fails to act, but the situation is not as immediate or certain as a danger-level classification requires.
What the symbol communicates
A warning symbol safety sign tells workers that a serious hazard is nearby and that ignoring it puts them at real risk of severe injury or death. The symbol paired with the signal word reinforces the specific threat, giving workers both a visual and a verbal cue to act before they get any closer to the hazard.
Standard colors, shapes, and headers
These signs use an orange header panel with black lettering spelling WARNING in bold type, following ANSI Z535 specifications. The orange and black combination signals elevated danger without reaching the near-certain life-threat level that red communicates on danger signs.
Orange specifically signals a serious hazard but not the same near-certain death risk that a red danger sign conveys.
Where to use it and examples
Place warning signs wherever a potentially severe hazard exists but a worker could realistically avoid injury with proper attention. Common placements include:
- Rotating equipment with accessible pinch points
- Chemical storage areas with toxic or corrosive materials
- Elevated work platforms above safe fall heights
- High-pressure systems that could fail under misuse
Compliance and ordering tips
Your warning signs must follow ANSI Z535.2 or Z535.4 depending on whether you're labeling a facility or a product. Verify your decal material can withstand your specific environment, since faded or damaged signage fails to communicate any hazard level to the workers who need it most.
4. Caution signs
Caution signs sit at the third severity level in the ANSI Z535 classification system, below danger and warning. They apply when a hazard could cause minor to moderate injury if a worker doesn't pay attention. The risk is real, but it's not likely to be fatal under normal conditions.
What the symbol communicates
A caution symbol safety sign tells workers that a low-to-moderate hazard is present and that basic awareness will keep them safe. The symbol identifies the specific risk, whether it's a slipping surface, a pinch point, or a tripping hazard, so workers can adjust their behavior before they reach the danger zone.
Standard colors, shapes, and headers
Caution signs use a yellow header panel with black lettering spelling CAUTION in bold type, following ANSI Z535 specifications. Yellow signals a condition that requires attention and care but doesn't carry the life-threatening urgency of orange or red.
Yellow is the standard color for caution-level hazards under ANSI Z535, and using it on a higher-severity hazard misrepresents the actual risk level.
Where to use it and examples
Place caution signs wherever a moderate or nuisance-level hazard exists that a worker can avoid with basic attention. Common placements include:
- Wet or slippery floors in entry areas and production floors
- Low overhead clearance in warehouses and loading docks
- Uneven surfaces or step-down areas in foot-traffic zones
- Minor pinch points on low-speed equipment
Compliance and ordering tips
Your caution signs must follow ANSI Z535.2 for facility signs or ANSI Z535.4 for product labels. Check that your decal material holds up to your environment, since a yellowed or peeling caution sign communicates nothing useful to the workers passing by it.
5. Notice and safety instruction signs
Notice and safety instruction signs cover non-hazard information that workers still need to follow to keep operations running safely and correctly. These signs don't indicate an injury risk the way danger or warning signs do, but ignoring them can lead to property damage, process errors, or downstream safety failures that create bigger problems down the line.
What the symbol communicates
A notice or safety instruction symbol safety sign communicates procedural requirements rather than physical hazards. The symbols and text on these signs direct behavior, such as reminding workers to log out equipment, follow a specific process, or avoid unauthorized access to certain areas.
Standard colors, shapes, and headers
Notice signs use a blue header panel with white lettering spelling NOTICE in bold type, following ANSI Z535 specifications. Safety instruction signs may use a green header when they direct workers toward safe behaviors or positive actions, such as required equipment checks or proper storage procedures.
Blue for notice and green for safety instruction are distinct from hazard-level colors, which means workers can immediately recognize these signs as informational rather than hazard alerts.
Where to use it and examples
Place these signs wherever procedural compliance or operational information needs to be visible. Common placements include:
- Authorized personnel only areas and restricted equipment zones
- Lockout/tagout instruction panels on equipment
- Proper disposal stations for materials and waste
- Hand-washing or hygiene requirement areas
Compliance and ordering tips
These signs follow ANSI Z535.2 for facility use or ANSI Z535.4 for product applications. Choose durable decal materials rated for your environment to keep the messaging legible through daily wear.
6. Mandatory action and PPE signs
Mandatory action and PPE signs tell workers exactly what they must do before entering a space or operating equipment. These signs don't warn about a hazard the way danger or warning signs do; they require a specific behavior, and your workers need to comply before they take another step.
What the symbol communicates
A mandatory action symbol safety sign uses a pictogram to depict the required action, such as wearing eye protection, hearing protection, gloves, or a hard hat. The symbol removes any ambiguity by showing the required behavior visually, so even workers who don't share a common language with posted text can understand what's expected of them.
Standard colors, shapes, and headers
These signs use a blue circular symbol on a white or blue background, following the ISO and ANSI format for mandatory instructions. Blue carries the specific meaning of a required action in safety signage systems, which makes it distinct from the hazard-alert colors like red, orange, and yellow.
Blue on a safety sign always signals a requirement, not a suggestion, so your workers need to treat it accordingly.
Where to use it and examples
Place mandatory action signs at entry points to controlled areas where specific PPE or behaviors are required. Common placements include:
- Hard hat zones in construction and manufacturing areas
- Eye and ear protection requirements near grinding, machining, or loud equipment
- High-visibility vest zones on loading docks
- Hand protection requirements near chemical handling stations
Compliance and ordering tips
These signs follow ANSI Z535.2 for facilities and ISO 7010 for internationally recognized symbols. Order your decals in materials rated for your specific environment so the blue color and symbol clarity hold up through daily exposure.
7. Prohibition and restricted access signs
Prohibition and restricted access signs tell workers what they must not do in a specific area or around specific equipment. These signs don't warn about a hazard that might injure you; they draw a hard boundary around an action or space, and crossing that boundary creates liability for your facility and real risk for your people.
What the symbol communicates
A prohibition symbol safety sign uses a pictogram to show the forbidden action, with a red circle and diagonal slash overlaid on the image. The visual format makes the meaning universally clear without relying on text, which is especially important in facilities where workers speak multiple languages.
Standard colors, shapes, and headers
These signs use a red circle with a diagonal bar on a white background, following the ISO 3864 and ANSI Z535 format for prohibition symbols. Red carries the same urgency here as it does on danger signs, communicating that the action shown is absolutely off-limits.
Red prohibition symbols follow international standards, which means your workers recognize them whether they learned safety signage in the US or abroad.
Where to use it and examples
Place prohibition signs wherever specific actions or access must be prevented. Common placements include:
- No smoking areas near flammable materials or oxygen equipment
- No entry zones for unauthorized personnel near restricted machinery
- No food or drink areas in chemical handling spaces
- No mobile device zones near explosive atmospheres
Compliance and ordering tips
These signs follow ANSI Z535.2 for facilities and ISO 3864 for internationally recognized symbols. Order decals in materials rated for your specific environment so the red color and symbol clarity stay sharp through daily wear and exposure.
8. Fire safety equipment signs
Fire safety equipment signs identify exactly where fire suppression tools are located so workers can find them in seconds during an emergency. A facility that stores extinguishers, hose reels, and fire blankets without clearly marking their locations is putting people at a disadvantage when every second counts.
What the symbol communicates
A fire safety symbol safety sign shows workers where fire suppression equipment is stored and, in some cases, how to use it. The symbol communicates location and access, not a hazard warning, which places these signs in a separate category from danger or warning classifications.
Standard colors, shapes, and headers
Fire safety signs use a red background with white symbols and text, following NFPA and ISO 3864 standards. Red here signals fire-related equipment rather than a hazard prohibition, and the white pictogram on red is internationally recognized as the fire safety color scheme.
Red on a fire safety sign means fire equipment location, not danger level, so your workers need to understand the distinction.
Where to use it and examples
Place these signs wherever fire suppression equipment is installed or stored. Common placements include:
- Fire extinguisher mounting points on walls and columns
- Fire hose reel cabinets in commercial and industrial buildings
- Fire blanket stations near welding areas or kitchens
- Sprinkler system control valves and fire suppression panels
Compliance and ordering tips
These signs follow NFPA 10 and local fire code requirements for placement and visibility. Order your decals in high-durability materials that hold their red color under UV exposure and heat so the signage stays readable through real emergency conditions.
9. Emergency exit and first aid signs
Emergency exit and first aid signs serve one purpose: getting people out safely and to medical help quickly when something goes wrong. These signs operate outside the hazard-warning system entirely. Rather than alerting workers to a risk, they direct people toward safety in the moments where clear navigation matters most.
What the symbol communicates
An emergency exit or first aid symbol safety sign communicates a route or resource, not a hazard level. The symbols show workers where to go and what help is available, from exit routes and stairwell directions to the nearest first aid kit or eyewash station.
Standard colors, shapes, and headers
These signs use a green background with white symbols and text, following ISO 7010 and ANSI Z535 standards for safe condition signage. Green signals safety and a positive direction, which visually separates these signs from hazard-alert colors like red, orange, and yellow.
Green on a safety sign means a safe route or resource, not a warning, and your workers need to recognize that distinction on instinct.
Where to use it and examples
Place these signs wherever exit routes and first aid resources need to be immediately visible. Common placements include:
- Exit doors, stairwells, and evacuation route corridors
- First aid kit mounting locations on walls and columns
- Eyewash station and emergency shower locations
- AED cabinet placements in high-foot-traffic areas
Compliance and ordering tips
These signs follow OSHA 29 CFR 1910.37 for exit route marking and ANSI Z535.2 for facility signage. Order your decals in photoluminescent or high-contrast materials so they stay visible even when power fails during an emergency.
What to do next
You now have a complete picture of every symbol safety sign type your facility might need, from the red header on a danger sign to the green background on an emergency exit decal. Each sign type carries a specific color, format, and message that your workers read instantly, and getting those details right keeps your team safe and your facility compliant with OSHA and ANSI Z535 standards.
The next step is straightforward: audit your current signage against the classifications in this guide and identify the gaps. Look at where your highest-severity hazards are posted, check that your colors match the actual risk levels, and flag any signs that are faded, damaged, or missing entirely. Once you know what you need, order custom safety decals and labels built to your exact specifications, with the right materials, colors, and symbols for every location in your facility.
