PAL

Ptolemaeus Arabus et Latinus

_ (the underscore) is the placeholder for exactly one character.
% (the percent sign) is the placeholder for no, one or more than one character.
%% (two percent signs) is the placeholder for no, one or more than one character, but not for blank space (so that a search ends at word boundaries).

At the beginning and at the end, these placeholders are superfluous.

κατὰ διαίρεσιν‘by separating (subtracting)’

Greek

References: Alm. Heiberg: I.13, 69:21-22
Translated into:
Arabic: على التفصيل [Alm. MS Tunis: 14b.3]
Arabic: على وجه التفصيل [Alm. MS Leiden: f. 10v]
Modern translations:
English: by separating (subtracting)
Synonyms:
διελόντι[Alm. Heiberg: I.10, 45:1]