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.

على التفصيل ‘by separating (subtracting)’

Arabic

References: Alm. MS Tunis: 14b.3
Translation of:
Greek: κατὰ διαίρεσιν [Alm. Heiberg: I.13, 69:21-22]
Synonyms:
بالتفصيل[Alm. MS Tunis: ]
على وجه التفصيل[Alm. MS Leiden: f. 10v]
وإذا فصّلنا[Alm. MS Leiden: f. 7v]