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.

طول ‘longitude’

Arabic. – Grammar: n.

References: Alm. MS Leiden: f. 14v. – Alm. MS Tunis: 19b.1. – Plan. Hyp.: II.4
Translation of:
Greek: μῆκος [Alm. Heiberg: II.1, 88:10]