noun
Computing term for a character or sequence used to separate data fields or tokens.
CSVファイルでは、カンマが区切り子として使われる。
In CSV files, commas are used as delimiters.
デリミタ is a common loanword synonym, often used interchangeably with 区切り子 in technical contexts.
Compound of 区切り (delimitation, break) and 子 (small thing, child), likely a calque or translation of English 'delimiter'.