This cheat sheet lists 16 Geometry symbols from nyuyo. It includes angle, arc, circle and more. Each entry shows the symbol, its meaning, LaTeX command, Unicode code point and HTML entity. Every entry also shows how to read an example aloud.
angle
Character
∠
Name
Angle
Meaning
Names an angle by its vertex, or by three points with the vertex in the middle.
LaTeX
\angle
Unicode
U+2220
HTML entity
∠
Example expression
∠ABC = 90°
Read aloud
angle A B C equals ninety degrees
Related symbols
Measured Angle, Degree, Theta, Perpendicular
arc
Character
⌒
Name
Arc
Meaning
Written over two points on a circle to name the arc between them. In print the mark sits above the letters.
LaTeX
\overset{\frown}{AB}
Unicode
U+2312
HTML entity
⌒
Example expression
⌒AB = 60°
Read aloud
arc A B measures sixty degrees
Related symbols
Circle, Angle, Degree, Pi
circle
Character
○
Name
Circle
Meaning
Names a circle, usually by its center. It is a different character from the small ring used for composition and degrees.
LaTeX
\bigcirc
Unicode
U+25CB
HTML entity
○
Example expression
○O
Read aloud
circle O
Related symbols
Arc, Pi
congruent-to
Character
≅
Name
Congruent To
Meaning
States that two figures have the same shape and size. In algebra it is also used for isomorphism.
LaTeX
\cong
Unicode
U+2245
HTML entity
≅
Example expression
△ABC ≅ △DEF
Read aloud
triangle A B C is congruent to triangle D E F
Related symbols
Triangle, Equals, Identical To
degree
Character
°
Name
Degree
Meaning
The unit for angles in which a full turn is 360 degrees. It is also used for temperature.
LaTeX
^\circ
Unicode
U+00B0
HTML entity
°
Example expression
90°
Read aloud
ninety degrees
Related symbols
Angle, Measured Angle
measured-angle
Character
∡
Name
Measured Angle
Meaning
Refers to the size of an angle rather than the angle as a figure. In LaTeX it needs the amssymb package.
LaTeX
\measuredangle
Unicode
U+2221
HTML entity
∡
Example expression
∡ABC = 45°
Read aloud
the measure of angle A B C is forty-five degrees
Related symbols
Angle, Degree
not-congruent
Character
≇
Name
Not Congruent
Meaning
States that two figures differ in shape or size. In algebra it also means that two structures are not isomorphic. In LaTeX it needs the amssymb package.
LaTeX
\ncong
Unicode
U+2247
HTML entity
≇
Example expression
△ABC ≇ △DEF
Read aloud
triangle A B C is not congruent to triangle D E F
Related symbols
Congruent To, Triangle
not-parallel
Character
∦
Name
Not Parallel
Meaning
States that two lines are not parallel, so in the plane they meet at some point. In LaTeX it needs the amssymb package.
LaTeX
\nparallel
Unicode
U+2226
HTML entity
∦
Example expression
AB ∦ CD
Read aloud
A B is not parallel to C D
Related symbols
Parallel, Perpendicular, Not Equal
parallel
Character
∥
Name
Parallel
Meaning
States that two lines run in the same direction and never meet.
LaTeX
\parallel
Unicode
U+2225
HTML entity
∥
Example expression
AB ∥ CD
Read aloud
A B is parallel to C D
Related symbols
Perpendicular, Angle
parallelogram
Character
▱
Name
Parallelogram
Meaning
Names a parallelogram by its four vertices, listed in order around the figure. In LaTeX there is no standard command; \parallelogram comes from unicode-math.
LaTeX
\parallelogram
Unicode
U+25B1
HTML entity
▱
Example expression
▱ABCD
Read aloud
parallelogram A B C D
Related symbols
Parallel, Rectangle, Square, Triangle
perpendicular
Character
⊥
Name
Perpendicular
Meaning
States that two lines or vectors meet at a right angle.
LaTeX
\perp
Unicode
U+22A5
HTML entity
⊥
Example expression
AB ⊥ CD
Read aloud
A B is perpendicular to C D
Related symbols
Parallel, Angle, Degree
rectangle
Character
▭
Name
Rectangle
Meaning
Names a rectangle by its four vertices, listed in order around the figure. In LaTeX there is no standard command; \rectangle comes from unicode-math.
LaTeX
\rectangle
Unicode
U+25AD
HTML entity
▭
Example expression
▭ABCD
Read aloud
rectangle A B C D
Related symbols
Square, Parallelogram, Right Angle, Perpendicular
right-angle
Character
∟
Name
Right Angle
Meaning
Marks an angle of exactly 90 degrees. In LaTeX there is no standard command; \rightangle comes from packages such as mathabx or unicode-math.
LaTeX
\rightangle
Unicode
U+221F
HTML entity
∟
Example expression
∟ABC
Read aloud
right angle A B C
Related symbols
Angle, Perpendicular
spherical-angle
Character
∢
Name
Spherical Angle
Meaning
Names an angle formed by two arcs of great circles on a sphere. In LaTeX it needs the amssymb package.
LaTeX
\sphericalangle
Unicode
U+2222
HTML entity
∢
Example expression
∢ABC
Read aloud
spherical angle A B C
Related symbols
Angle, Measured Angle
square-shape
Character
□
Name
Square
Meaning
Names a square or quadrilateral by its vertices. The same mark often ends a proof, and in physics it denotes the d'Alembert operator. In LaTeX it needs the amssymb package.
LaTeX
\square
Unicode
U+25A1
HTML entity
□
Example expression
□ABCD
Read aloud
square A B C D
Related symbols
Rectangle, Parallelogram
triangle
Character
△
Name
Triangle
Meaning
Names a triangle by its three vertices.
LaTeX
\triangle
Unicode
U+25B3
HTML entity
△
Example expression
△ABC ≅ △DEF
Read aloud
triangle A B C is congruent to triangle D E F
Related symbols
Congruent To, Angle, Capital Delta
FAQ
How many Geometry symbols are on this page?
This page lists 16 Geometry symbols, including angle, arc, circle.
How do I type Geometry symbols in LaTeX?
Each symbol on this page has its LaTeX command shown next to it, for example \angle, \bigcirc, \cong. Copy the command into your maths mode.
What are the Unicode code points for Geometry symbols?
Every symbol lists its Unicode code point, such as U+00B0, U+221F, U+2220, so you can insert it in documents and web pages.
How do I write Geometry symbols in HTML?
Each entry shows its HTML entity where one exists, for example ∠, ∡, ∟. You can paste it directly into your page.
How do I read Geometry symbols aloud?
Each symbol has an example expression and a spoken version, such as △ABC ≅ △DEF, ∟ABC, ∠ABC = 90° read as triangle A B C is congruent to triangle D E F, A B is not parallel to C D, A B is parallel to C D.