n.

an emblem (a small piece of plastic or cloth or metal) that signifies your status (rank or membership or affiliation etc.)

"they checked everyone's badge before letting them in"

any feature that is regarded as a sign of status (a particular power or quality or rank)

"wearing a tie was regarded as a badge of respectability"

Badges of status and the cost of aggression
Badges in Social Media: A Social Psychological Perspective
Steering user behavior with badges
Active badges and personal interactive computing objects
Active badges and personal interactive computing objects
The Evolution of Reliable and Unreliable Badges of Fighting Ability
Evidence for reliable badges of status in territorial yellow warblers (Dendroica petechia).
Rolls of badge stock for use in printing identification badges in roll-fed printers
Social cost of tail loss in Uta stansburiana : lizard tails as status-signalling badges
Antimicrobial credit cards, identification cards, membership cards and identification badges and badge holders