# Symbols:A

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### atto-

$\mathrm a$

The Système Internationale d'Unités symbol for the metric scaling prefix atto, denoting $10^{\, -18 }$, is $\mathrm { a }$.

Its $\LaTeX$ code is \mathrm {a} .

### are

$\mathrm a$

The are is a measure of area:

One are is equal to a square whose side measures $10$ metres.

 $\ds$  $\ds 1$ are $\ds$ $=$ $\ds 100$ square metres $\ds$ $\approx$ $\ds 119 \cdot 60$ square yards

$\mathrm A$ or $\mathrm a$

The hexadecimal digit $10$.

Its $\LaTeX$ code is \mathrm A  or \mathrm a.

### Celestial Altitude

$a$

Let $X$ be a point on the celestial sphere.

The (celestial) altitude of $X$ is defined as the angle subtended by the the arc of the vertical circle through $X$ between the celestial horizon and $X$ itself.

It is often denoted by $a$.

### Azimuth (Astronomy)

$A$

Let $X$ be a point on the celestial sphere.

The spherical angle between the principal vertical circle and the vertical circle on which $X$ lies is the azimuth of $X$.

The azimuth is usually measured in degrees, $0 \degrees$ to $180 \degrees$ either west or east, depending on whether $X$ lies on the eastern or western hemisphere of the celestial sphere.

It is often denoted by $A$.

### Ampere

$\mathrm A$

The symbol for the ampere is $\mathrm A$.

Its $\LaTeX$ code is \mathrm A .

### Angstrom

$\mathring {\mathrm A}$

The symbol for the angstrom is $\mathring {\mathrm A}$.

Its $\LaTeX$ code is \mathring {\mathrm A} .

### Alternating Group

$A_n$

Its $\LaTeX$ code is A_n .

### acos

$\operatorname {acos}$

The arccosine function.

Its $\LaTeX$ code is \operatorname {acos} .

### acosec

$\operatorname {acosec}$

The arccosecant function.

Its $\LaTeX$ code is \operatorname {acosec} .

### acosech

$\operatorname {acosech}$

The real area hyperbolic cosecant function.

Its $\LaTeX$ code is \operatorname {acosech} .

### acosh

$\operatorname {acosh}$

The real area hyperbolic cosine function.

Its $\LaTeX$ code is \operatorname {acosh} .

### acot

$\operatorname {acot}$

The arccotangent function.

Its $\LaTeX$ code is \operatorname {acot} .

### acoth

$\operatorname {acoth}$

The real area hyperbolic cotangent function.

Its $\LaTeX$ code is \operatorname {acoth} .

### acsc

$\operatorname {acsc}$

The arccosecant function.

Its $\LaTeX$ code is \operatorname {acsc} .

### acsch

$\operatorname {acsch}$

The real area hyperbolic cosecant function.

Its $\LaTeX$ code is \operatorname {acsch} .

### actn

$\operatorname {actn}$

The arccotangent function.

Its $\LaTeX$ code is \operatorname {actn} .

### actnh

$\operatorname {actnh}$

The real area hyperbolic cotangent function.

Its $\LaTeX$ code is \operatorname {actnh} .

$\adj {\mathbf A}$

The $\LaTeX$ code for $\adj {\mathbf A}$ is \adj {\mathbf A} .

### aln

$\operatorname {aln}$

The antilogarithm of the natural logarithm.

Its $\LaTeX$ code is \operatorname {aln} .

### alog

$\operatorname {alog}_b$

The antilogarithm of a general logarithm to base $b$.

If no base is given, the common logarithm (that is, base $10$) is assumed.

The $\LaTeX$ code for $\operatorname {alog}_b$ is \operatorname {alog}_b .

### amp

$\operatorname {amp}$

Its $\LaTeX$ code is \operatorname {amp} .

### Ann

$\operatorname {Ann}$

Its $\LaTeX$ code is \operatorname {Ann} .

### arg

$\arg$

Its $\LaTeX$ code is \arg .

### Arg

$\operatorname {Arg}$

Its $\LaTeX$ code is \Arg .

### asec

$\operatorname {asec}$

The arcsecant function.

Its $\LaTeX$ code is \operatorname {asec} .

### asech

$\operatorname {asech}$

The real area hyperbolic secant function.

Its $\LaTeX$ code is \operatorname {asech} .

### asin

$\operatorname {asin}$

The arcsine function.

Its $\LaTeX$ code is \operatorname {asin} .

### asinh

$\operatorname {asinh}$

The real area hyperbolic sine function.

Its $\LaTeX$ code is \operatorname {asinh} .

### atan

$\operatorname {atan}$

The arctangent function.

Its $\LaTeX$ code is \operatorname {atan} .

### atn

$\operatorname {atn}$

The arctangent function.

Its $\LaTeX$ code is \operatorname {atn} .

### atanh

$\operatorname {atanh}$

The real area hyperbolic tangent function.

Its $\LaTeX$ code is \operatorname {atanh} .

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