curly bracket; curly brace
Refers to the punctuation marks { and }. Used in mathematics, programming, and text formatting.
The part enclosed in curly brackets is optional.
In JSON, objects are represented with curly braces.
角括弧 refers to square brackets [ ].
Compound of 波 (nami, 'wave') and 括弧 (kakko, 'bracket'), from the wavy shape of the brackets.