Angle is the ratio between an arc and its radius.
http://www.ontology-of-units-of-measure.org/resource/om-2/Angle
plane angle
β
γ
θ
φ
angle
Angle
α
http://www.ontology-of-units-of-measure.org/resource/om-2/picoradian
http://www.ontology-of-units-of-measure.org/resource/om-2/centiradian
http://www.ontology-of-units-of-measure.org/resource/om-2/second-Angle
http://www.ontology-of-units-of-measure.org/resource/om-2/mil-Angle
http://www.ontology-of-units-of-measure.org/resource/om-2/milliradian
http://www.ontology-of-units-of-measure.org/resource/om-2/microradian
http://www.ontology-of-units-of-measure.org/resource/om-2/deciradian
http://www.ontology-of-units-of-measure.org/resource/om-2/millisecond-Angle
http://www.ontology-of-units-of-measure.org/resource/om-2/radian
http://www.ontology-of-units-of-measure.org/resource/om-2/revolution
http://www.ontology-of-units-of-measure.org/resource/om-2/minute-Angle
http://www.ontology-of-units-of-measure.org/resource/om-2/microsecond-Angle
http://www.ontology-of-units-of-measure.org/resource/om-2/degree
http://www.ontology-of-units-of-measure.org/resource/om-2/metrePerMetre
http://www.ontology-of-units-of-measure.org/resource/om-2/nanoradian
http://www.ontology-of-units-of-measure.org/resource/om-2/gon
http://www.ontology-of-units-of-measure.org/resource/om-2/attoradian
http://www.ontology-of-units-of-measure.org/resource/om-2/femtoradian
http://www.ontology-of-units-of-measure.org/resource/om-2/Quantity