After slipping his watch into Belle Epoch's pocket, Norton Folgate threatened to blow a whistle to attract the attention of plainclothes police officers. (AUDIO: Parasite)
The Fifteenth Doctor used a whistle provided by the Memory TARDIS to control the real TARDIS against Sutekh. (TV: Empire of Death [+]Russell T Davies, Doctor Who series 14 (BBC One and Disney+, 2024).)