The Doctor's whistle
From Tardis Wiki, the free Doctor Who reference
A whistle was once found by the Fifteenth Doctor inside the Memory Tardis.
The whistle appeared as a steel whistle on a red lanyard. The lanyard was the same color as the molecular rope. The Doctor's whistle had the ability to control the TARDIS to some degree. (TV: Empire of Death [+]Loading...["Empire of Death (TV story)"])
