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.

μέρος τῶν σελιδίων‘set of columns’

Greek

References: Alm. Heiberg: II.4, 97:21, 98:1
Translated into:
Arabic: قسم من صفوف [Alm. MS Tunis: 21b.4-5]
Arabic: سطر [Alm. MS Leiden: f. 16r]
Modern translations:
English: set of columns [Alm. Toomer: 80]