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A bio-damper is a device, which can be as small as a ring that masks the bio-signature of an individual. (DW: The Runaway Bride)
History
The Doctor gave Donna a bio-damper so that she would be hidden from the Racnoss. However, bio dampers are ineffective against Huon particles. (DW: The Runaway Bride)
Martin Trueman had a bio-damper to hide the fact that he had the Ancient Lights in him. (SJA: Secrets of the Stars)
In 2010, Gavin wore a bio-damper ring he inherited from his father which hid his alien origins. (SJA: The Empty Planet)