Q
[1] The letter on the sidewall of a
tire denoting the maximum speed for which it is designed (160 kph or 100mph). See
speed rating., [2] A symbol for "
throughput.", [3] A symbol for the quantity of water discharged, usually in m
3s
-1., [4] A symbol of merit, often called the Q-factor, for an energy-storing device, resonant system, or tuned circuit., [5] A symbol for "
charge."