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Many early video terminals and dot-matrix printers rendered the vertical bar character as the allograph broken bar ¦. This may have been to distinguish the character from the lower-case 'L' and the upper-case ' I ' on these limited-resolution devices, and to make a vertical line of them look more like a horizontal line of dashes.
X bar, x̄ (or X̄) or X-bar may refer to: X-bar theory, a component of linguistic theory; Arithmetic mean, a commonly used type of average; An X-bar, a rollover ...
For most symbols, the entry name is the corresponding Unicode symbol. So, for searching the entry of a symbol, it suffices to type or copy the Unicode symbol into the search textbox. Similarly, when possible, the entry name of a symbol is also an anchor, which allows linking easily from another Wikipedia article. When an entry name contains ...
Symbol Name Date of earliest use ... See History of algebra: The symbol x. 1637 [2] René Descartes (La Géométrie) ... Blackboard bold capital N (for natural ...
Script capital I 2110 ℑ: Black-letter capital I 2111 ℒ: Script capital L 2112 ℓ: Script small L (LaTeX: \ell) 2113 ℔ L B bar symbol 2114 ℕ: Double-struck capital N 2115 № Numero sign: 2116 ℗ Sound recording copyright symbol: 2117 ℘ Script capital P alias: Weierstrass elliptic function 2118 ℙ: Double-struck capital P 2119 ℚ ...
the symbol ϖ, a graphic variant of π, is sometimes construed as omega with a bar over it; see π; the unsaturated fats nomenclature in biochemistry (e.g. ω−3 fatty acids) the first uncountable ordinal (also written as Ω) the clique number (number of vertices in a maximum clique) of a graph in graph theory
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Random variables are usually written in upper case Roman letters, such as or and so on. Random variables, in this context, usually refer to something in words, such as "the height of a subject" for a continuous variable, or "the number of cars in the school car park" for a discrete variable, or "the colour of the next bicycle" for a categorical variable.