Tricycle
From Memory Alpha, the free Star Trek reference.
A Tricycle is a three-wheeled vehicle, where the user sitting on it peddles to make the wheels turn. It was a common toy for Human children on Earth.
In 2266, Doctor McCoy found a broken tricycle on an unnamed planet in what appeared to be an abandoned city. (TOS: "Miri")
While attempting to correct the orbit of the Bre'el IV moon, in 2366, Captain Jean-Luc Picard wondered if there was any way that the USS Enterprise-D could "coax that satellite back where it belongs?" Chief Engineer Geordi La Forge figured that the ship would need "a delta-vee of 4 kilometers per second," a task that "even with warp power would mean exceeding the recommended engine output by 47 percent." He then analogized the scenario, describing the task as being comparable to "an ant pushing a tricycle. A slim chance." (TNG: "Deja Q")
A vehicle similar to a tricycle was utilized by Mezoti on USS Voyager in 2376. Instead of peddling, there was an open space between the back wheels to push-off like a scooter, and the user stood while using it. (VOY: "Child's Play")
