Where does “diagramma” come from?

diagramma (Finnish) comes from Italian diagramma, from Ancient Greek διάγραμμα, from Ancient Greek δῐᾰ-, from Ancient Greek διά, from Proto-Indo-European dwís, from Proto-Indo-European dwóh₁ — two.

Ancestry of “diagramma”, step by step

Step	Language	Word	Meaning
1	Italian	diagramma	diagram; chart; graph
2	Ancient Greek	διάγραμμα	That which is marked out in lines, plan, diagram
3	Ancient Greek	δῐᾰ-	apart; through, across; through; in different...
4	Ancient Greek	διά	throughout
5	Proto-Indo-European	dwís	twice, doubly; in two
6	Proto-Indo-European	dwóh₁	two

Every word from Proto-Indo-European dwóh₁ →Every word from Ancient Greek δῐᾰ- →Every word from Proto-Indo-European dwís →