Tentacle
A tentacle or tendril was a flexible, elongated organ present in some species of animals or alien lifeforms.

The space vessel lifeform had matter/energy tendrils, which they used for touching the tendrils of other members of their species. ()

An alien in 's 2151 drawing "" had tentacles. ()

The Vendorians were known to have tentacles, as were the Ba'Neth. Kelvans in their natural form were immense beings that had a hundred tentacle-like limbs. (; ; )

A symbiotic lifeform which managed to gain access to the  starship  in 2152 snared several crewmembers with tendrils. ()

In 2370, Julian Bashir was almost strangled by the tentacle of a metamorphic lifeform, actually a mutated Odo. Bashir injured the creature by cutting its tentacle with a laser scalpel. ()

In 2373, the tentacle of a creature grabbed Kira Nerys' hand when a serpent worm was delivered to Deep Space 9. ()

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Anatomy