Where does “pH” come from?

pH (Translingual) comes from Translingual H, from Etruscan 𐌇, from Ancient Greek η, from Phoenician 𐤇, from Egyptian ?.

Ancestry of “pH”, step by step

Step	Language	Word	Meaning
1	Translingual	H	hydrogen
2	Etruscan	𐌇	—
3	Ancient Greek	η	Lower-case eta, the seventh letter of the ancient Greek alphabet. Its name was ἦτα and it represented a long open-mid front unrounded vowel:. It is often transliterated as either e or i. It is preceded by ζ and followed by θ
4	Phoenician	𐤇	het; heth
5	Egyptian	?	—