扶梯 (fú tī) literally means 'to support + ladder/staircase' — the character 扶 suggests helping, holding, or steadying (as one might do when using moving stairs), while 梯 means 'ladder' or 'stairs'. Together, they form a compound noun referring specifically to an escalator: a powered, moving staircase commonly found in shopping malls, subway stations, and large buildings in China. Unlike static stairs (楼梯, lóu tī), a 扶梯 operates continuously and requires users to hold the handrail for safety.

This word is neutral in register and widely used in everyday speech and signage. It’s distinct from 电梯 (diàn tī, elevator) and 楼梯 (lóu tī, regular stairs). While 扶梯 emphasizes the supportive function of the handrail and motion, it’s never used for stationary steps or ladders. You’ll often see it on directional signs (e.g., '扶梯向上') or in instructions ('请靠右站立，左侧通行').