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.

\(\displaystyle \) \(\) \(\displaystyle 1\) are
\(\displaystyle \) \(=\) \(\displaystyle 100\) square metres
\(\displaystyle \) \(\approx\) \(\displaystyle 119 \cdot 60\) square yards


Hexadecimal

$\mathrm A$ 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 $A$.


Alternating Group

$A_n$

The alternating group on $n$ letters.


Inverse

a-

Prefix indicating anti.

An abbreviation for arc, anti- or argument.


Not

a-

Prefix indicating not.


alog

Abbreviation for the antilogarithm of a general logarithm.
If no base is given, the common logarithm (that is, base $10$) is assumed.