The symbol ↑, an upward pointing arrow, also called up arrow, uparrow, or upwards arrow, may refer to:

Notation

* ↑, a mathematical symbol for "

undefined Undefined may refer to: Mathematics * Undefined (mathematics), with several related meanings ** Indeterminate form, in calculus Computing * Undefined behavior, computer code whose behavior is not specified under certain conditions * Undefined ...

" * ↑, a notation of

Knuth's up-arrow notation In mathematics, Knuth's up-arrow notation is a method of notation for very large integers, introduced by Donald Knuth in 1976. In his 1947 paper, R. L. Goodstein introduced the specific sequence of operations that are now called ''hyperoperati ...

for very large integers * ↑, a mathematical game theory position ''Up'' * ↑ or

Sheffer stroke In Boolean functions and propositional calculus, the Sheffer stroke denotes a logical operation that is equivalent to the negation of the conjunction operation, expressed in ordinary language as "not both". It is also called nand ("not and") ...

, 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 * ↑, ↑, a HTML or XML

character entity In SGML, HTML and XML documents, the logical constructs known as ''character data'' and ''attribute values'' consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series ...

* ↑, 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 (^).

Notation

Character representations

See also