Flute

A flute was a musical instrument. It was one of several instruments which the Eighth Doctor could play. (PROSE: The Year of Intelligent Tigers)

Jo Grant incorrectly called the Second Doctor's recorder a flute when it appeared on the Third Doctor's TARDIS console. (TV: The Three Doctors) A confused Sixth Doctor made a similar mistake, while suffering from a time-slip with the Second Doctor. (TV: The Two Doctors)