# Symbols:H

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### hecto-

$\mathrm h$

The Système Internationale d'Unités symbol for the metric scaling prefix hecto, denoting $10^{\, 2 }$, is $\mathrm { h }$.

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

### Celestial Altitude

$h$

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 usually denoted by $h$.

### Subgroup

$H$

Frequently used to represent a general subgroup of a given group $G$.

### Function

$\map h x$

The letter $h$, along with $f$ and $g$, is frequently used to denote a general mapping or function.

The $\LaTeX$ code for $\map h x$ is \map h x .

### Hectometre

$\mathrm {hm}$

The symbol for the hectometre is $\mathrm {hm}$:

$\mathrm h$ for hecto
$\mathrm m$ for metre.

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

### Heaviside Step Function

$\map H x$

The symbol used to denote the Heaviside step function is sometimes seen as $\map H x$.

The $\LaTeX$ code for $\map H x$ is \map H x .

### Harmonic Numbers

$H_n$

The harmonic numbers are denoted $H_n$ and are defined for positive integers $n$:

$\ds \forall n \in \Z, n \ge 0: H_n = \sum_{k \mathop = 1}^n \frac 1 k$

The $\LaTeX$ code for $H_n$ is H_n .

### General Harmonic Numbers

$H_n^{\paren r}$

Let $r \in \R_{>0}$.

For $n \in \N_{> 0}$ the Harmonic numbers order $r$ are defined as follows:

$\ds H_n^{\paren r} = \sum_{k \mathop = 1}^n \frac 1 {k^r}$

The $\LaTeX$ code for $H_n^{\paren r}$ is H_n^{\paren r} .

### Magnetic Field Strength

$\mathbf H$

The usual symbol used to denote magnetic field strength is $\mathbf H$.

Its $\LaTeX$ code is \mathbf H .

### Set of Quaternions

$\Bbb H$

The set of quaternions.

The $\LaTeX$ code for $\mathbb H$ is \mathbb H  or \Bbb H.

### Null Hypothesis

$H_0$

Used to denote the null hypothesis: Definition:Null Hypothesis

The $\LaTeX$ code for $H_0$ is H_0 .

### Alternative Hypothesis

$H_1$

Used to denote the alternative hypothesis: Definition:Alternative Hypothesis

The $\LaTeX$ code for $H_1$ is H_1 .

### Hour Angle

$\mathrm {HA}$

Used as an abbreviation and to denote the hour angle. Definition:Hour Angle

The $\LaTeX$ code for $\mathrm {HA}$ is \mathrm {HA} .

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