Libra's sigil is Latin, it's a real excerpt from the tenth key of The Twelve Keys of Basil Valentine, an alchemical text on the transmutation of gold.

The English translation reads:
"I am born from Hermogenes. Hyperion elected me. Without Iamsoph I am destined to perish".

Iansoph is not a real term in Latin or English, it's a mistranslation reproduced from Basil's original text, referring to the Hebrew term *Ein Sof* (אֵין סוֹף) meaning "infinity" or "the endless".