Where does “∆” come from?

∆ (Translingual) comes from Ancient Greek δ, from Phoenician 𐤃, from Egyptian 𓉿.

Ancestry of “∆”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	δ	Lower case delta (δέλτα), the fourth letter of Greek alphabet. It represented in Ancient Greek a voiced dental plosive: and in modern Greek a voiced dental fricative:. It is preceded by γ and followed by ε
2	Phoenician	𐤃	dalet; daleth
3	Egyptian	𓉿	—