control character

(computing) A character which does not have a direct visual appearance as a glyph, but rather causes some other action to occur, such as a transition to a new line.

Japanese Meaning

制御文字: 表示可能なグリフとしての直接的な視覚表現はなく、代わりに改行などの処理を引き起こす文字。

What is this buttons?

When parsing the log file, the program failed because an unexpected control character disrupted the encoding.

Google Translation / DeepL Translation

ログファイルを解析していると、予期しない制御文字によってエンコーディングが乱れ、プログラムが失敗しました。

Details

Sense（1）

(computing) A character which does not have a direct visual appearance as a glyph, but rather causes some other action to occur, such as a transition to a new line.