A pictograph or pictogram was a singular symbol in a pictographic alphabet which represented a word, slang, phrase, or number.
In 1996, while going through Henry Starling's computer, Chakotay noted several pictographs, surmising that each symbol corresponded to one of the programs on the device. (VOY: "Future's End")
The Calder II artifact was covered in glyphs and pictograms. In 2370, Jean-Luc Picard noted their similarity to early Vulcan symbols rather than Romulan. (TNG: "Gambit, Part II")
The Reman language made use of pictographs to represent verb roots. Data noted this in 2379 while attempting to unlock one of Scimitar's doors, to the frustration of Captain Picard. (Star Trek Nemesis)
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