insignia (n.)

• badge
• banner
• character
• characteristic
• decoration
• device
• differentia
• earmark
• emblem
• hallmark
• idiosyncrasy
• image
• index
• indicant
• indicator
• keynote
• mark
• measure
• note
• peculiarity
• picture
• property
• regalia
• representation
• representative
• seal
• sign
• signal
• signature
• stamp
• symptom
• trait