Where does “scriptum” come from?

scriptum (Latin) comes from Latin scrībō, from Proto-Italic skreiβō, from Proto-Indo-European skreybʰ- — to write.

Ancestry of “scriptum”, step by step

Step	Language	Word	Meaning
1	Latin	scrībō	—
2	Proto-Italic	skreiβō	to carve
3	Proto-Indo-European	skreybʰ-	to write

scriptum — Etymology, Origin & Word History | Etymology Explorer