A unit of frequency equal to the number of oscillations in 2 pi seconds, proposed by Sas and Pidduck in 1947.¹ Symbol, p. So far as I am aware, never actually used.
Whatever the utility of such a unit, it is hard to imagine a more confusing choice of a name.
1. R. K. Sas and F. B Pidduck.
The Metre-Kilogram-Second System of Electrical Units.
London: Methuen and Co., 1947.
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Last revised: 3 February 2010.