Symbol

Symbol is in for the name of an object for use in .

In principle any symbol can be used as symbols. It is written in place of the object name and is identical to its meaning. That means it that a symbol can always by it assigned the object names be replaced and in reverse.

Symbols become particularly in that and into that and applied.

Standards

Numerous symbols are standardized (z. B. internationally <math>=</math> for "is equivalent" or <math>V</math> for that ). Such standardizations are for example 31 and 1304.

If as symbols Letter are used, come particularly frequently the German (latin), Greek, old Germans and Hebrew to the employment. Most letter symbols consist only few of and of more than one letter. Around that to extend, the letters indices often become from letters or Numbers attached.

Mathematical symbols

Variable objects

In that letters are usually used as symbols, if it itself around variable acts. For that Text record becomes usually one Serif writing used.

Examples to rule of the used and the text record:

• Scalar one: <math>a=7</math>
• : fat or with overarrow. <math>\vec F\equiv\mathbf{F}=m \cdot \mathbf{a}</math>. In former times also small letters in German type writing: <math>\mathfrak{x} = \left(0 \ 2 \ 1 \right)^T</math>
• : largely; fat or with double senkrechten lines <math>3 \in\mathbf{N}\equiv\mathbb{N}</math>
• : <math>\det (\mathsf{M})=4</math>. In former times also: Capital letter in German type writing <math>\mathfrak{E}:= \begin{pmatrix} 1 & \cdots & 0 \ \ \vdots & \ddots & \vdots \ \ 0 & \cdots & 1 \end{pmatrix} </math>

Remaining objects

Other objects, the z.B. Instructions contained, special get assigned, which originate only partially (originally) from alphabets.

Examples:

• <math>:= </math> Assignment: <math>a:= 3</math>
• <math><</math> Comparison "smaller than": <math>a<7</math>
• <math>></math> Comparison "more largely than": <math>7>a</math>
• + Add operator: <math>a+4=7</math>
• <math>\sum</math> : <math>a=\sum_{i=1}^{n}a_{i}</math>
• () changing the analysis sequence: <math>3a+7 \neq 3(a+7)</math>
• : <math>\pi\approx 3{,}14159</math>

Physical symbols

In that used symbols consist of latin or a Greek letter. You Sentence taken place (after 1313) also Serifs.

Sample applications:

• <math>R = {U of \over I}\quad</math> meant "the electrical is equal to that divide by those electrical amperage."
• <math>E={m\cdot c^2}\quad</math> meant "those is equal to that times that that in ."

See also:
List of the physical symbols

Symbol in programming languages

In used symbols yield for practical reasons usually of those of the Writ off. They are limited to those on that available .

Example: Smaller or directly

• Writ: <math>\leq</math>
• numerous : < =
• : \leq