Ventaxian

2360s

TNG S04E13 "Devil's Due"

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TNG 1x3 Code of Honor Ligonian 2.png
 

Same symbol was used for Romulan interior decoration (TNG S05E08 "Reunification 2") and Vulcan interior decoration (ENT S02E14 “Stigma”)

TNG 5x08 Unification - Ventaxian Reuse.png
ENT 2x14 Stigma Ventaxian Reuse 1.png