Star for Mathematical Excellence, as named in the Full Circle novelisation
Talk about it here.
Adric won a badge for "mathematical excellence". (TV: Full Circle) It was fashioned in a star shape with gold edges. The Fifth Doctor used this badge to kill a Cyber-Leader within the TARDIS control room; by crushing the badge into its chest unit, the Doctor suffocated the Cyberman before shooting it with a Cyber-gun. (TV: Earthshock)
Behind the scenes
- In recognition of his death, the closing credits of Earthshock rolled in silence over the broken pieces of Adric's badge.