noun
editing character
Computing term for a character used in editing contexts, such as control characters or special symbols in text processing.
このソフトでは、編集用文字を挿入してレイアウトを調整できます。
In this software, you can insert editing characters to adjust the layout.
Compound of 編集 (editing) + 用 (for) + 文字 (character). A straightforward modern technical term.