indicator (n.)

• arbiter
• arbitrator
• badge
• banner
• bencher
• bob
• character
• characteristic
• critic
• device
• differentia
• display
• earmark
• galvanometer
• gauge
• hallmark
• hygrometer
• idiosyncrasy
• image
• index
• indicant
• insignia
• interferometer
• judge
• justice
• keynote
• lead
• logger
• magistrate
• mark
• measure
• meter
• moderator
• needle
• note
• peculiarity
• picture
• plumb
• plummet
• pointer
• potentiometer
• probe
• property
• pyrometer
• referee
• representation
• representative
• seal
• sign
• signal
• signature
• sound
• stamp
• symptom
• thermocouple
• trait
• umpire