The symbol ↑, an upward pointing arrow, also called up arrow, uparrow, or upwards arrow, may refer to: Notation ↑, a mathematical symbol for "undefined" ↑, a notation of Knuth's up-arrow notation for very large integers ↑, a mathematical game theory position Up ↑ or Sheffer stroke, the logical connective "not both" or NAND ↑, the APL function 'take' "Increased" (and similar meanings), in medical notation ↑, a chemical symbol for production of gas, which bubbles up. Character representations ↑, upwards arrow, a Unicode arrow symbol ↑, &uarr;, a HTML or XML character entity ↑, codepoint 8A (hex) in EBCDIC Code page 293, used for writing APL ↑, the glyph for character 94 (decimal) in ASCII until 1967, when it was replaced by the caret (^). See also Ꙟ, an archaic Romanian Cyrillic letter Arrow keys, on computer keyboards Arrow (disambiguation) ↓ (disambiguation) → (disambiguation) ← (disambiguation) Up (disambiguation)