character special file
A Unix/Linux device file that transfers data character by character, such as terminals or serial ports. Technical computing term.
In Linux, /dev/tty is one of the character special files.
A block special file transfers data in blocks, unlike a character special file which transfers data character by character.
Compound of 文字型 (character type) + 特殊 (special) + ファイル (file), a direct translation of the English computing term 'character special file'.