Zipper
A zippered pocket (right)
Two zippers on a Starfleet uniform
A zipper was a mechanism with interlocking teeth used to join two edges of fabric together.
In 2063, Zefram Cochrane's jacket had a zippered pocket on the arm. (Star Trek: First Contact)
The standard Starfleet uniform jumpsuit of the 22nd century featured pockets with zippers on the chest. (Star Trek: Enterprise)
The 2260s Starfleet woman's duty uniform closed with a zipper down the back. (TOS: "Where No Man Has Gone Before")
In 2375, Geordi La Forge compared the USS Enterprise-E's warp core to a zipper, saying they were pulling it across space like one. (Star Trek: Insurrection)