Jefferies tube
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A Jefferies tube' (also Jeffries tube) was a reference any of a number of small access tunnels on a starship. From these handy locations, any number of problems could be solved just in time to save the ship from imminent destruction. (TLE novel: Serpents Among the Ruins)
After Starfleet arrived on Terok Nor and renamed it Deep Space 9, the tiyerta nok, became known as Jefferies tubes. (DS9 novels: The Fall of Terok Nor, Inferno)
