noun
Computing term for a character or symbol used to separate data elements, such as commas in CSV or tabs in TSV.
CSVファイルでは、カンマが分離記号として使われる。
In CSV files, commas are used as separators.
区切り文字 is a more general term for delimiter, while 分離記号 is a technical computing term.
Compound of 分離 (separation) and 記号 (symbol).