Handwriting
Handwriting was the formation of alphabetic letters by hand. Signatures and autographs were examples on handwriting.

By analyzing a handwriting sample, it was possible to determine things about the writer, such as whether they forged it or which hand was their dominant one. In 2369, Data, while playing Sherlock Holmes on the holodeck, analyzed the handwriting on a supposed suicide note and discovered that it was written by the victim's deceased brother. ()

In 2374, Quark pointed out Morn's handwriting on a  of latinum to Constable Odo. ()

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Visual art