The word 安全带 is formed by combining three distinct characters, each contributing its core meaning to create a new, composite concept. It begins with 安 (ān), representing "peace" or "security", and is paired with 全 (quán), meaning "whole" or "complete", to form the compound 安全, conveying the integrated idea of "safety". This concept then directly modifies the final character 带 (dài), meaning "belt" or "strap", resulting in a literal, descriptive phrase that means "safety belt", an object whose entire purpose is defined by the first two characters.