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.

علم العدد ‘arithmetic’

Arabic

References: Alm. MS Leiden: I.1:14, f. 3r:1
Translation of:
Greek: ἀριθμητική [Alm. Heiberg: I.1, 6:21]
Translated into:
Latin: numerus  [Alm. Gerard: I.1:14, f. 1vb:19]
Synonyms:
العدد[Alm. MS Tunis: I.1:14, f. 2r:12]