This is a purple note, and written in English by (an) Athetos.
It allows translation from the Sudran language to English. It is necessary to read other notes collected which were written in Sudran.
By manually building a table of which Sudran letters correspond to the English alphabet by turning the passcode on and off, it is possible to manually translate the Passcode inscribed in Sudran on the roof of the room at the bottom of Eribu and gain access to the Orbital Discharge.
The "programming language" in the note may be a reference to Primordial Code.