IQ

An IQ was a variable used in measuring intelligence. Many geniuses boasted of their IQs. 176 was considered an enormous IQ. (TV: The Sontaran Stratagem)

Oswald was a human genius with an IQ so high that it could not be measured. (COMIC: Children of the Evil Eye)

Luke Rattigan, another human genius, had an IQ of 176. (TV: The Sontaran Stratagem)

When Miss Evangelista was uploaded to the Library Data Core, she theorised that a decimal point had shifted in her IQ. Before then, she had been pleased to have the IQ of a plankton. (TV: Forest of the Dead)

Miss Kizlet, using the technology of the Great Intelligence, had a tablet that was able to 'hack' into, among other things, peoples' IQs. (TV: The Bells of Saint John)