Machete
From Tardis Wiki, the free Doctor Who reference
A machete was a large knife for fighting, and also for cutting foliage and food.
Styre, the Sontaran, used a machete to fight the Fourth Doctor. (TV: The Sontaran Experiment)
The Tenth Doctor and Rose Tyler used machetes to cut through foliage while looking for the Dramos (COMIC: Blood and Tears)
Chris Cwej used one to cut open coconuts when he and the Seventh Doctor were stranded on an island. (PROSE: No Room)