From The Free On-line Dictionary of Computing (30 December 2018) :
left brace
open brace
{
"{". ASCII character 123.
Common names: open brace; left brace; left squiggly; left
squiggly bracket/brace; left curly bracket/brace; ITU-T:
opening brace. Rare: brace ("" = unbrace); curly ("}" =
uncurly); leftit ("" = rytit); left squirrelly; INTERCAL:
embrace ("" = bracelet).
right+brace+("">Paired with right brace ("").
(1995-03-16)