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Reference.org
Angular displacement
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<p>The angular displacement (symbol θ, ϑ, or φ) – also called angle of rotation, rotational displacement, or rotary displacement – of a <a href="/facts/Physical_body/WhqjK6xo">physical body</a> is the <a href="/facts/Angle/gFUTEQYq">angle</a> (in <a href="/facts/Unit_of_measurement/pvTpWbmC">units</a> of <a href="/facts/Radian/Srd38Sxa">radians</a>, <a href="/facts/Degree_(angle)/f48Ns8SX">degrees</a>, <a href="/facts/Turn_(geometry)/QczxAyuM">turns</a>, etc.) through which the body <a href="/facts/Rotation/yChkz49x">rotates</a> (revolves or spins) around a centre or <a href="/facts/Axis_of_rotation/PGcg3IY5">axis of rotation</a>. Angular displacement may be signed, indicating the sense of rotation (e.g., <a href="/facts/Clockwise/3Npe4Swe">clockwise</a>); it may also be greater (in <a href="/facts/Absolute_value/dwJBpEs5">absolute value</a>) than a full <a href="/facts/Turn_(angle)/QczxAyuM">turn</a>. </p>