noun
delimiter set
Technical computing term for a set of characters used to separate data fields or tokens.
CSVファイルでは、区切り子集合としてカンマやタブが使われる。
In CSV files, commas or tabs are used as the delimiter set.
区切り文字 refers to a single delimiter character, while 区切り子集合 refers to the entire set of delimiters used in a context.
Compound of 区切り (delimiter) + 子 (child, element) + 集合 (set). The exact derivation is uncertain; it is a technical term likely coined in computing contexts.