‘回车键’ literally means ‘return-car key’, a calque from English ‘carriage return’. In traditional typewriters, pressing the carriage return lever moved the carriage (holding the paper) back to the start of the line and advanced it one line — hence ‘return’ and ‘car’. In modern computing, 回车键 refers to the Enter key on keyboards, used to confirm input, submit forms, execute commands, or create line breaks in text editors. Though the mechanical function no longer exists, the term persists due to historical continuity.

This word is universally understood across Chinese-speaking regions and appears in all computer-related contexts — from software interfaces to beginner tech manuals. It’s neutral in register, appropriate for both spoken and written use, and often shortened colloquially to 回车 (huí chē) in informal settings like texting or coding discussions.