Subdermal implant
A subdermal implant was a device that was implanted under the skin. They could have a variety of purposes.

Kuroda Lor-ehn had subdermal implants installed on his wrists, designed to depolarize triburnium alloys. This enabled him to escape his restraints on an Enolian transport in 2152. ()

During the Occupation of Bajor, members of the Bajoran Resistance had subdermal implants composed of tritonium isotopes. In the event of capture, the implants could be activated to leave a trail that could be followed. In 2372, Major Kira Nerys used such a trail to find the survivors of the Ravinok. ()

See also 
 Subdermal bioprobe
 Subdermal transponder
 Subdermal transmitter

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Technology