Camouflage

Liz Shaw cited the TARDIS' chameleon circuit as an example of camouflage. (TV: Spearhead from Space)

Voord spaceships were able to camouflage themselves by attracting sand and rock and mimicking their molecular structures. (AUDIO: Beachhead)

The Cybermen from Telos had highly advanced technology for camouflage. They were able to hide an entire planet, Telos Minor, within the Telos system, so that it could not show up on scanners. The planetoid did not exist on any star maps. (AUDIO: Secrets of Telos)