A rubber band was a round band made of rubber that was used to secure things together.
In his captain's log, James T. Kirk compared the USS Enterprise's accidental time travel to the year 1969 to snapping a rubber band. (TOS: "Tomorrow is Yesterday")
In 2365, when Grebnedlog asked for help, Geordi La Forge responded by saying, "Let me guess. Their rubber band broke, right?" (TNG: "Samaritan Snare")
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