Q
An obsolete English dialect symbol, meaning a Farthing, and probably an ab- breviation of Quadrans.
In a work entitled Recorde of the Greate Artes, 1575 (p. 29), occurs the passage: " a farthing the iiij part of a penny."
Source: Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)