Warning signs

Interpretation of some safety signs in the biology laboratory

S/N	Safety sign & interpretation	Effects of failure to observe the precautions	Image
1	No Entry – Do not enter restricted areas	May result in health risks or exposure to dangerous substances
2	No Smoking – Smoking is prohibited	Can cause fire or health issues for both smokers and non-smokers
3	Fragile – Handle with care	Items can break easily, leading to loss or injury
4	Explosive – Risk of explosion	May cause injury or death due to blasts or flying fragments
5	Corrosive – Causes burns or damage	Can burn skin, eyes, clothes, furniture, or lab equipment
6	Flammable – Easily catches fire	Can lead to fire accidents if exposed to heat or flames
7	Toxic / Poison / Danger – Hazardous chemicals	Can cause serious illness or death by touch, inhalation, or ingestion
8	High Voltage – Electrical danger	May cause electric shock or death
9	Strong Radiation – Radiation hazard	Can cause skin damage, blindness, cancer, or genetic defects
10	Biohazard – Biological hazard	May cause infections, disease, or contamination through exposure to microbes/tissues
11	Slippery Floor – Wet or polished surfaces	Person may slip, fall, and get injured
12	Caution – General warning	Accidents such as spills, breakage, or injury may occur
13	Emergency Exit – Exit during danger	Delay or confusion during emergencies can cause injury or loss of life
14	Oxidizing Agent – Accelerates combustion	Increases the intensity of fire, causing larger accidents
15	Harmful or Irritant – Causes minor harm	May cause allergic reactions, skin or eye irritation, or long-term health issues
16	Health Hazard – Long-term health risks	Can cause cancer, infertility, genetic defects, or respiratory illness
17	Environmental Hazard – Harmful to nature	May pollute water or soil, and harm animals or ecosystems