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 v ...
"
* ↑, 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 logical negation, negation of the logical conjunction, conjunction operation, expressed in ordinary language as "not both". ...
, 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
The programming language APL uses a number of symbols, rather than words from natural language, to identify operations, similarly to mathematical symbols. Prior to the wide adoption of Unicode, a number of special-purpose EBCDIC and non-EBCDIC c ...
, 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
Arrow keys or cursor movement keys are buttons on a computer keyboard that are either programmed or designated to move the cursor (computers), cursor in a specified direction.
The term "cursor movement key" is distinct from "arrow key" in that ...
, on computer keyboards
*
Arrow (disambiguation)
An arrow is a projectile launched from a bow.
Arrow or arrows may also refer to:
Symbols
* Arrow (symbol)
** ↑ (disambiguation)
** → (disambiguation)
** ↓ (disambiguation)
** ← (disambiguation)
Places
* Arrow, Kentucky
* Arrow, ...
**
↓ (disambiguation)
The arrow symbol ↓ may refer to:
* The downward direction, a relative direction
* The keyboard cursor control key, an arrow key
* A downwards arrow, a Unicode arrow symbol
* Logical NOR, operator which produces a result that is the negation of ...
**
→ (disambiguation)
→ or -> may refer to:
* one of the arrow symbols, characters of Unicode
* one of the arrow keys, on a keyboard
* →, >, representing the assignment operator in various programming languages
* ->, a Pointer operator in C and C++ where a->b i ...
**
← (disambiguation)
*
Up (disambiguation)
{{disambiguation