An abandoned tricycle

A tricycle was a three-wheeled vehicle. The rider typically used foot pedals to make the wheels turn. It was a common toy for Human children on Earth.

A tricycle was on sale in an antiques shop in San Francisco in 1986. (Star Trek IV: The Voyage Home)

In 2266, Doctor McCoy found a broken tricycle on Earth Two 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 were 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 four 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 pedaling, there was an open space between the back wheels to push off like a scooter, and the user stood while riding it. (VOY: "Child's Play")

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