All stations are considered to possess rotational inertia, which is affected by the movement of players through that station. Clockwise (also 'Right' or 'Turnwise') spin is denoted by 'C+' or 'T
' (bold) and anticlockwise (also 'Left' or 'Widdershins') spin is denoted as 'C-' or 'w
' (n.b. lower case and italic, to avoid confusion with 'West'), and is calculated using the following formula:
S'=S + π.LV.Zē
S is the station's existing spin, LV is the player's LV, and Z is the zone in which the station is located. If the LV of the player causes spin in the direction opposed to S, the LV is considered to be negative.
Spin is also affected by Beck's, Token Loading, Spoon and Knip, and the handedness of the station as discussed in the IMCS 1992 ruleset, points 1003.ii,ii and v, 2127.i and ix, and 5006.xix.
Recent studies indicate that spin does not decay, except in Quadrant 5 and during games of Political MC.