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Service Studs
From Warhammer 40k - Lexicanum
Service Studs are metallic studs attached to the skull of a Space Marine, which visibly protrude through the skin of the forehead. The awards signify the number of the Marine's years in service to the Chapter. Different designs and shapes of studs denote different lengths of service.[1]
However, the practice of Service Studs is falling out of favor with many Chapters.[1]
Source
- 1: Insignium Astartes, pg. 62
