Where does “πτυχίο” come from?

πτυχίο (Greek) comes from Ancient Greek πτύχιον, from Ancient Greek πτυχή, from Ancient Greek πτῠ́σσω — to fold.

πτυχίο (Greek): academic degree

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	πτύχιον	A folding tablet; The pendant of an earring
2	Ancient Greek	πτυχή	fold
3	Ancient Greek	πτῠ́σσω	to fold