Workplace Safety Signs and Symbols: Colors, Shapes and Meanings

Safety signs and meanings help workers act quickly: red signals prohibition, danger or fire equipment; yellow warns of caution; blue shows mandatory action; and green marks safe conditions, first aid or exits. ISO 7010 supports global recognition, while OSHA 1910.145 and ANSI Z535 guide many US workplace signs.

Workplace safety signs are not decoration. They warn employees about hazards, show required actions, identify emergency routes, mark PPE zones and support everyday safety decisions. For US employers, supervisors, HR teams and safety managers, signs should be understood as part of a wider workplace safety system, not a replacement for training, procedures or hazard control.

In 2024, the US Bureau of Labor Statistics reported 2.5 million employer-reported nonfatal workplace injury and illness cases in private industry, while 5,070 fatal work injuries were recorded across the United States. These figures show why clear safety communication, including signs, symbols and employee training, remains important in daily operations. Source: US Bureau of Labor Statistics, 2026 release.

For a broader foundation, read Workplace Safety 101: The Complete Guide to HSE Fundamentals (2026).

The Safety Sign Color Code in One Table

The quickest way to understand safety signs and meanings is to start with colour. In US search language, this is often called the OSHA sign color code, although many workplaces also use ANSI Z535 and ISO 7010-style signs.

In global ISO-style signs, the most familiar colours are red, yellow, blue and green. In US workplaces, ANSI Z535 also uses signal words and additional colours to communicate severity and instructions.

Safety sign colours work best when employees are trained to connect the colour with the required behaviour.

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What Do Safety Sign Shapes Mean?

Safety signs use both colour and shape because workers may need to understand a message quickly, from a distance, in a noisy area or during an emergency.

This is why prohibition warning mandatory signs should not be treated as interchangeable. A red prohibition sign tells workers not to do something. A yellow warning sign alerts them to a hazard. A blue mandatory sign tells them what action they must take.

For example, a warehouse entrance may need a yellow forklift warning sign, a blue high-visibility vest sign and a green emergency exit sign. Each sign performs a different job.

OSHA Sign Color Code: What US Workplaces Should Know

US workplaces should understand OSHA requirements and ANSI-style safety communication. OSHA’s Law & Regulations pages explain that employers must comply with applicable OSHA standards and keep workplaces free from serious recognised hazards.

For accident prevention signs and tags, OSHA 29 CFR 1910.145 covers specifications for signs and tags used to prevent accidental injury or illness. OSHA also explains that accident prevention tags are used for temporary or unexpected hazardous conditions until the hazard is eliminated or the operation is completed.

OSHA 29 CFR 1910.144 addresses safety colour marking for physical hazards. It identifies red for certain danger, stop and fire-protection uses, and yellow as the basic colour for caution and physical hazards such as striking, stumbling, falling, tripping and caught-between risks.

Danger vs Warning vs Caution Signs

In many US workplaces, employees will see signal words such as Danger, Warning and Caution.

The exact sign format, wording and colour may depend on the hazard, the facility, the industry and the standards adopted by the organisation. Employers should avoid guessing. Safety signs should be selected based on the hazard, the workplace layout, employee exposure and applicable requirements.

ANSI Z535 vs ISO 7010 Safety Signs: What Is the Difference?

ISO 7010 safety signs are designed for global recognition. ISO states that ISO 7010 prescribes safety signs for accident prevention, fire protection, health hazard information and emergency evacuation. This makes ISO 7010 especially useful for multinational organisations, diverse workforces and workplaces where employees may speak different first languages.

ANSI Z535 is widely used in the United States for safety colours, symbols, product safety labels, tags and facility/environment safety signs. ANSI Z535.2-2023 addresses environmental and facility safety signs and supports consistent visual layout for signs used in workplaces and public environments.

The UK Health and Safety Executive also provides official guidance on safety signs and signals for employers and dutyholders through UK HSE. Internationally, occupational health and safety management systems such as ISO 45001 also support structured risk management, communication and worker participation.

For terminology differences across HSE, EHS, OHS and SHE, read HSE vs EHS vs OHS vs SHE: What Do They Mean and What’s the Difference?.

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25 Common Workplace Safety Symbols and Meanings

The following grid gives practical examples of common safety symbols workplace readers may see. Designers should create original symbol graphics for the published article and should not copy ISO, ANSI or regulator-owned artwork.

Safety signs are also closely linked to PPE and chemical hazard communication. For PPE selection and workplace examples, read Types of PPE: The Complete Guide to Personal Protective Equipment. For chemical labels, pictograms and SDS, read Hazard Communication and GHS: Labels, Pictograms and SDS Explained.

A Note on GHS Chemical Pictograms

GHS pictograms are not the same as general workplace safety signs, but they often appear in the same environments. Chemical containers may display pictograms for hazards such as flammability, corrosion, acute toxicity, gases under pressure or health hazards.

OSHA published a final rule in May 2024 updating the Hazard Communication Standard to align primarily with the seventh revised edition of GHS. OSHA later extended key compliance dates in January 2026. Employers handling hazardous chemicals should make sure workplace labels, SDS access and employee training reflect current HazCom requirements.

Where Are Workplace Safety Signs Required or Expected?

Safety signs may be required, expected or strongly recommended depending on the workplace, hazard and applicable rules. A safe approach is to place signs where employees need a clear warning, instruction, restriction or emergency direction.

Common areas include:

• Emergency exits and evacuation routes

• Fire extinguishers, alarms and fire equipment points

• Electrical rooms and panels

• Chemical storage and handling areas

• PPE-required zones

• Restricted access areas

• Forklift and vehicle routes

• Wet floors, trip hazards and uneven surfaces

• Confined spaces

• First aid, eyewash and emergency shower locations

• Machinery guarding and lockout areas

• Construction or maintenance zones

• Food handling and hygiene areas

• Healthcare infection-control zones

Employers should avoid two common mistakes: placing too few signs where hazards are unclear, and placing too many signs so that workers stop noticing them. Signs should be visible, readable, durable, placed near the hazard or decision point, and supported by training.

Sign Placement Checklist

Use this simple checklist when reviewing signage:

• Is the sign close to the hazard or required action?

• Can workers see it before they enter the risk area?

• Is it readable from the normal approach distance?

• Is it blocked by doors, equipment, shelves or stored materials?

• Is the sign still clean, current and undamaged?

• Is the lighting adequate?

• Is the message clear for the workforce?

• Are multilingual or symbol-led signs needed?

• Does the sign match the actual hazard?

• Have employees been trained on what to do?

How Employers Should Use Safety Signs in Staff Training

Safety signs should be part of workplace training, onboarding and supervision. They are most effective when employees understand the meaning, location and expected behaviour.

Employers, supervisors and safety teams can use signs during:

• New employee orientation

• Site induction

• Toolbox talks

• PPE training

• Hazard communication training

• Emergency drills

• Safety walks

• Incident reviews

• Refresher training

• Contractor briefings

A practical training session can ask workers to walk through the site and identify red, yellow, blue and green signs. The supervisor can then ask: What is the hazard? What action is required? Who should be informed if the sign is missing or damaged?

This turns signs from passive notices into active safety communication.

The International Labour Organization recognises occupational safety and health as a major workplace topic globally. In practice, effective safety communication depends on both clear systems and worker understanding.

Key Facts: Safety Signs and Meanings

• Red signs usually indicate danger, prohibition, fire equipment or emergency stop functions.

• Yellow or amber signs warn workers about hazards that require caution.

• Blue signs usually show mandatory actions, such as wearing PPE.

• Green signs identify safe conditions, emergency exits, first aid or rescue equipment.

• OSHA 1910.145 covers accident prevention signs and tags in US general industry.

• ANSI Z535 supports US safety colours, symbols, signal words and facility sign design.

• ISO 7010 supports internationally recognisable safety pictograms.

• Safety signs should support, not replace, hazard controls, procedures and training.

• Damaged, unclear or poorly placed signs should be corrected.

• Workers should know what action each safety sign requires.

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Conclusion

Understanding safety signs and meanings helps employees make faster, safer decisions at work. Colours, shapes, symbols and signal words can warn people about hazards, show required actions and identify emergency routes or equipment.

For US workplaces, OSHA 1910.145, OSHA 1910.144 and ANSI Z535 provide important safety-sign context. For global recognition, ISO 7010 helps create consistent pictograms that workers can understand across languages and regions.

The strongest safety sign systems combine clear signs with risk assessment, training, supervision, maintenance and review.

Continue Reading

• Workplace Safety 101: The Complete Guide to HSE Fundamentals (2026)

• HSE vs EHS vs OHS vs SHE: What Do They Mean and What’s the Difference?

• Types of PPE: The Complete Guide to Personal Protective Equipment

• Hazard Communication and GHS: Labels, Pictograms and SDS Explained

Written by GSA Safety Editorial Team for GSA — Global Safety Academy.
Technically reviewed by GSA Safety Review Team.
Last updated: June 2026.