Angular unit

angular measurementsangular
Throughout history, angles have been measured in many different units.wikipedia
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Minute and second of arc

masarcsecondarc second
Subdivisions of the degree are minute (symbol ', 1' = 1/60°) and second {symbol ", 1" = 1/3600°}.
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to 1⁄60 of one degree.

Shot grouping

groupinggroupingsgroup of shots
Often that measurement is converted into angular measurements, such as milliradians (mils) or minutes of angle (MOAs), which expresses the size of shot spreads regardless of the target distance.

Red dot sight

red dotred dot sightsreflex sight
Red dot sight reticle sizes are measured in milliradians (mrad or mil) and minutes of angle (moa), which both are angular measurements, making them handy units to use in ballistics.

Measure (mathematics)

measuremeasure theorymeasurable
Throughout history, angles have been measured in many different units.

Degree (angle)

°degreesdegree
The most contemporary units are the degree and radian (rad), but many others have been used throughout history.

Radian

radiansradmicroradian
The most contemporary units are the degree and radian (rad), but many others have been used throughout history.

History of mathematics

historian of mathematicsmathematicshistory
The most contemporary units are the degree and radian (rad), but many others have been used throughout history.

Turn (geometry)

turnturnsrevolution
In some contexts, such as identifying a point on a circle or describing the orientation of an object in two dimensions relative to a reference orientation, angles that differ by an exact multiple of a full turn are effectively equivalent.

Spiral

spiralswhorlspiral patterns
In other contexts, such as identifying a point on a spiral curve or describing the cumulative rotation of an object in two dimensions relative to a reference orientation, angles that differ by a non-zero multiple of a full turn are not equivalent.

Theta

ΘGreek letter ThetaΘ
In order to measure an angle θ, a circular arc centered at the vertex of the angle is drawn, e.g. with a pair of compasses.

Arc (geometry)

arccircular arcarcs
In order to measure an angle θ, a circular arc centered at the vertex of the angle is drawn, e.g. with a pair of compasses.

Compass (drawing tool)

compasscompassesdrafting compass
In order to measure an angle θ, a circular arc centered at the vertex of the angle is drawn, e.g. with a pair of compasses.

Circumference

circumferentialgirthcircumferential line
One turn, for which θ = n units, corresponds to an arc equal in length to the circle's circumference, which is 2

Unit of measurement

unitunits of measurementunits
Throughout history, angles have been measured in many different units.

International System of Units

SISI unitsSI unit
The radian is the derived quantity of angular measurement in the SI system.

Dimensionless quantity

dimensionlessdimensionless numberdimensionless quantities
By definition, it is dimensionless, though it may be specified as rad to avoid ambiguity.

Degree symbol

°degreedegree sign
Angles measured in degrees, are shown with the symbol °.

Sexagesimal

sexagesimal systembase 60base-60

Eratosthenes

Eratosthenes of Cyrenea seminal experimentEratosthenis