Taboo
A taboo was a cultural prohibition.

During a mission to Capella IV in 2267, Captain James Kirk was concerned that a large landing party had a greater chance of violating one of the Capellans' many taboos. ()

The Ghorusda Disaster in the mid-24th century was officially blamed by Starfleet on "carelessness about Ghorusdan cultural taboos" by Captain Darson of the . ()

Reassociation was taboo for Trill, punishable by exile of both host and symbiont. ()

The Zhal Makh was considered taboo to non-Romulans. ()

See also
Stigma
Obscenity

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Psychology