非常口

1. Origins, structure, and basic meaning

• Structure: 非常口, read ひじょうぐち, combines emergency 非常 with opening or exit 口 as a safety-facility name.
• Basic usage: It denotes an exit provided for escape during a fire or other emergency, as in 非常口の位置.

2. Common pitfalls and similar expressions

• Scope and context
  • Its purpose differs from an ordinary entrance and exit 出入口; location marking matters so it can be found in an emergency.