# Unit 16 Other Geometric Symbols Used in Geometric Formulas

Angle (∠) | ⠸⠪ |

Superscript | ⠔ |

Subscript | ⠢ |

Greek Letter Indicator | ⠨ |

Pi (π) | ⠨⠏ |

Prime (feet or arcminutes) | ⠶ |

Double Prime (inches or arcseconds) | ⠶⠶ |

## Angle

The angle sign is a two-cell symbol with a prefix of dots 4-5-6 followed by dots 2-4-6. When transcribed into braille, it follows print spacing and formatting.

## Examples:

∠3

**⠸⠪**⠼⠉

Measure ∠CED.

⠠⠍⠂⠎⠥⠗⠑⠀**⠸⠪**⠠⠠⠉⠙⠑⠲

## Superscript and Subscript

Level-down and level-up indicators are used to indicate superscript or subscript numbers or letters.

## Examples:

2_{3}

⠼⠃**⠢**⠼⠉

9^{2}

⠼⠊**⠔**⠼⠃

Since the superscript and subscript indicators also have a contracted meaning, a grade 1 indicator must be used if the symbol can be misinterpreted as a contraction.

## Examples:

niacin is vitamin B_{3}

⠝⠊⠁⠉⠊⠝⠀⠊⠎⠀⠧⠊⠞⠁⠍⠔⠀⠠⠃**⠰⠢**⠼⠉

Notice that the subscript uses a grade 1 indicator so that the phrase is not read as vitamin ben3.

H_{2}O

⠠⠓**⠰⠢**⠼⠃⠠⠕

Notice that the subscript uses a grade 1 indicator so that the phrase is not read as Hen2O.

## Greek Letters

The Greek letter indicator (dots 4-6) is placed before a letter of the alphabet to indicate that it is to be read as a Greek letter such as alpha (⠨⠁), beta (⠨⠃), gamma (⠨⠛), or delta (⠨⠙).

## Pi

The pi symbol (⠨⠏) is made up of a Greek letter indicator followed by the letter p. It follows print spacing and formatting when written in braille.

## Examples:

A = **π**r^{2}

⠠⠁⠀⠐⠶⠀**⠨⠏**⠗⠰⠔⠼⠃

**π** = 3.14…

**⠨⠏**⠀⠐⠶⠀⠼⠉⠲⠁⠙⠲⠲⠲

C = 2**π**r

⠰⠠⠉⠀⠐⠶⠀⠼⠃**⠨⠏**⠗

## Prime

The prime symbol is commonly used to represent feet and double prime to represent inches (although they can be used for angular measurement and other mathematic functions as well).

Note: Sometimes a single quotation mark and a double quotation mark are used in print but are transcribed in braille as prime and double prime.

## Examples:

5**'** 6**"**

⠼⠑**⠶**⠀⠼⠋**⠶⠶**

I would like the 6" sub please.

⠠⠊⠀⠺⠙⠀⠇⠀⠮⠀⠼⠋**⠶⠶**⠀⠎⠥⠃⠀⠏⠇⠂⠎⠑⠲