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In 2256, Captain Philippa Georgiou deliberately walked in the shape of a Starfleet delta, creating an image in the sand on the Crepusculan homeworld. This was done in order to enable the USS Shenzhou to locate herself and Commander Michael Burnham. Upon encountering their own footprints ahead of them, Burnham mistakenly believed they had been walking together in aimless circles and were therefore lost. (DIS: "The Vulcan Hello")
Finding the footprints of the White Rabbit on the Shore Leave Planet in 2267 convinced James T. Kirk that Leonard McCoy's wild claims had a basis in reality. Later, McCoy noticed a girl's footprints accompanying them, which further cemented his story. (TOS: "Shore Leave")