Symbols:Z

General Variable

 * $z$

Used to denote a general variable, usually in conjunction with other variables $x$ and $y$.

Complex Variable
Used to denote a general variable in the complex plane.

The $\LaTeX$ code for $z$ is z.

Random Variable

 * $Z$

Used to denote a general random variable, usually in conjunction with another random variables $X$ and $Y$.

The $\LaTeX$ code for $Z$ is Z.

The Set of Integers

 * $\Z$

The set of integers:
 * $\Z = \left\{{\ldots, -3, -2, -1, 0, 1, 2, 3, \ldots}\right\}$.

From the German Zahlen, which means (whole) numbers.

The $\LaTeX$ code for $\Z$ is \Z.

The Set of Non-Zero Integers

 * $\Z^*$

The set of non-zero integers:
 * $\Z^* = \left\{{\ldots, -3, -2, -1, 1, 2, 3, \ldots}\right\}$.

The $\LaTeX$ code for $\Z^*$ is \Z^*.

The Set of Coprime Integers Modulo m

 * $\Z'_m$

The set $\Z'_m$ is the set of all integers modulo $m$ which are prime to $m$:
 * $\Z'_m = \left\{{\left[\!\left[{k}\right]\!\right]_m \in \Z_m: k \perp m}\right\}$.

See Set of Coprime Integers.

The $\LaTeX$ code for $\Z'_m$ is \Z'_m.

The Set of Integer Multiples

 * $n \Z$

The Set of Integer Multiples $n \Z$ is defined as:
 * $\left\{{x \in \Z: n \backslash x}\right\}$

for some $n \in \N$.

That is, it is the set of all integers which are divisible by $n$, that is, all multiples of $n$.

The $\LaTeX$ code for $n \Z$ is n \Z.

The Gaussian Integers

 * $\Z \left[{i}\right]$

The $\LaTeX$ code for $\Z \left[{i}\right]$ is \Z \left[{i}\right].

Subsets of Integers

 * $Z \left({n}\right)$

Used by some authors to denote the set of all integers between $1$ and $n$ inclusive:
 * $Z \left({n}\right) = \left\{{x \in \Z: 1 \le x \le n}\right\} = \left\{{1, 2, \ldots, n}\right\}$

That is, an alternative to Subsets of Natural Numbers $\N^*_n$.

The $\LaTeX$ code for $Z \left({n}\right)$ is Z \left({n}\right).