The head was visible in a few episodes, but while the doorway was initially labeled “CONFERENCE” in “Gambit, Part II”, it was relabelled “HEAD” by “Emergence”. In addition, in episodes throughout the seventh season, multiple crew members can be seen simultaneously entering the bridge via the head. It is unclear how many toilets are available for use in the head on the main bridge.
The more you know!
https://memory-alpha.fandom.com/wiki/Bathroom
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Why was Riker always constipated?
He couldn’t go #2 because he was #1
This is the real reason O’Brien transferred to DS9. Cardassian sewage disposal systems are (by necessity) much hardier than Starfleet’s.