専用

1. Origins, structure, and basic meaning

• Structure: 専用, read せんよう, means dedicated or reserved for one purpose or a specified group of users.
• Basic usage: It marks a pen made specifically for fine lines or a rear entrance restricted to staff.

2. Common pitfalls and similar expressions

• Something dedicated to one purpose or group
  • It restricts use to a particular purpose or group, such as a fine-line pen or a staff-only entrance. It contrasts with something available to everyone for any use.