2 ‾‾ OVERLINE
3 ℏℏℏ PLANCK CONSTANT OVER TWO PI
4 ↕↕ UP DOWN ARROW
5 ⇕⇕ UP DOWN DOUBLE ARROW
6 ⎛⎛ LEFT PARENTHESIS UPPER HOOK
7 ⎜⎜ LEFT PARENTHESIS EXTENSION
8 ⎝⎝ LEFT PARENTHESIS LOWER HOOK
9 ⎞⎞ RIGHT PARENTHESIS UPPER HOOK
10 ⎟⎟ RIGHT PARENTHESIS EXTENSION
11 ⎠⎠ RIGHT PARENTHESIS LOWER HOOK
12 ⎡⎡ LEFT SQUARE BRACKET UPPER CORNER
13 ⎢⎢ LEFT SQUARE BRACKET EXTENSION
14 ⎣⎣ LEFT SQUARE BRACKET LOWER CORNER
15 ⎤⎤ RIGHT SQUARE BRACKET UPPER CORNER
16 ⎥⎥ RIGHT SQUARE BRACKET EXTENSION
17 ⎦⎦ RIGHT SQUARE BRACKET LOWER CORNER
18 ⎧⎧ LEFT CURLY BRACKET UPPER HOOK
19 ⎨⎨ LEFT CURLY BRACKET MIDDLE PIECE
20 ⎩⎩ LEFT CURLY BRACKET LOWER HOOK
21 ⎪⎪⎪⎪ CURLY BRACKET EXTENSION
22 ⎫⎫ RIGHT CURLY BRACKET UPPER HOOK
23 ⎬⎬ RIGHT CURLY BRACKET MIDDLE PIECE
24 ⎭⎭ RIGHT CURLY BRACKET LOWER HOOK