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.

ἀριθμητική ‘arithmetic’

Greek. – Grammar: n.

References: Alm. Heiberg: I.1, 6:21
Translated into:
Arabic: العدد [Alm. MS Tunis: I.1:14, f. 2r:12]
Arabic: علم العدد [Alm. MS Leiden: I.1:14, f. 3r:1]
Modern translations:
English: arithmetic [Alm. Toomer: 36]