‾‾ OVERLINE ℏℏℏ PLANCK CONSTANT OVER TWO PI ↕↕ UP DOWN ARROW ⇕⇕ UP DOWN DOUBLE ARROW ⎛⎛ LEFT PARENTHESIS UPPER HOOK ⎜⎜ LEFT PARENTHESIS EXTENSION ⎝⎝ LEFT PARENTHESIS LOWER HOOK ⎞⎞ RIGHT PARENTHESIS UPPER HOOK ⎟⎟ RIGHT PARENTHESIS EXTENSION ⎠⎠ RIGHT PARENTHESIS LOWER HOOK ⎡⎡ LEFT SQUARE BRACKET UPPER CORNER ⎢⎢ LEFT SQUARE BRACKET EXTENSION ⎣⎣ LEFT SQUARE BRACKET LOWER CORNER ⎤⎤ RIGHT SQUARE BRACKET UPPER CORNER ⎥⎥ RIGHT SQUARE BRACKET EXTENSION ⎦⎦ RIGHT SQUARE BRACKET LOWER CORNER ⎧⎧ LEFT CURLY BRACKET UPPER HOOK ⎨⎨ LEFT CURLY BRACKET MIDDLE PIECE ⎩⎩ LEFT CURLY BRACKET LOWER HOOK ⎪⎪⎪⎪ CURLY BRACKET EXTENSION ⎫⎫ RIGHT CURLY BRACKET UPPER HOOK ⎬⎬ RIGHT CURLY BRACKET MIDDLE PIECE ⎭⎭ RIGHT CURLY BRACKET LOWER HOOK