The shape of a brace:
"curly"
\overbrace
\underbrace
"square"
\overbracket
\underbracket
"round"
\overparen
\underparen
The shape of a brace:
"curly": ⏞ and ⏟, as LaTeX's\overbraceand\underbrace;"square": ⎴ and ⎵, as\overbracketand\underbracket;"round": ⏜ and ⏝, as\overparenand\underparen.