We'd like to use analytics cookies to understand which symbols people look up, so we know what to research next. They are not used for advertising and we set none of them unless you say yes. What we store.
Braces marking a repeatable part.
Also known as: Repetition notation grammar, Zero or more notation
The Extended Backus-Naur Form notation marking a part of a rule that may repeat any number of times.
Marks a part of a grammar rule that may repeat any number of times, including none.
Contexts: Technical drawing, Software
Replaces the recursive rule plain BNF would need, so the extension trades a formal property for readability rather than adding expressive power.
Contexts: Technical drawing, Software
A pair of curved braces, one opening and one closing, enclosing the repeatable part of a rule.
A fuller structured visual breakdown is not yet documented for this symbol.