'Safety helmet' is a protective headgear worn to prevent injury from falling objects, impacts, or electrical hazards. The word combines three characters: 安 (ān) meaning 'safe' or 'security', 全 (quán) meaning 'complete' or 'whole', and 帽 (mào) meaning 'hat' or 'cap'. Together, 安全帽 literally means 'safety-complete-hat' — emphasizing full protection for the head. It is standard equipment in construction sites, mining, manufacturing, and other industrial settings where head injury risks exist.

This term is formal and technical; it’s rarely used in casual conversation outside occupational safety contexts. Unlike generic terms like 帽子 (màozi, 'hat'), 安全帽 specifically denotes certified, impact-resistant head protection meeting national or international safety standards (e.g., GB 2811 in China). It is often paired with verbs like 戴 (dài, 'to wear') or 检查 (jiǎnchá, 'to inspect').