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.

سطح ‘lit. rectangle, it denotes multiplication between two line segments’

Arabic

References: Alm. MS Leiden: f. 6r
Translation of:
Greek: ὀρθογώνιον [Alm. Heiberg: I.10, 33:6]
Synonyms:
سطح / السطح القائم الزوايا [Alm. MS Tunis: ]