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.

دائرة الأفق‘horizon’

Arabic

References: Plan. Sidoli+Berggren: 51, 73, 78, 80, 82, 88, 89, 90, 169, 281, 289, 293, 319, 321, 342, 343, 350
Modern translations:
English: the horizon circle [Plan. Sidoli+Berggren: ?]
Synonyms:
أُفُق[Alm. MS Leiden: I.2:23, f. 3r:25. – Alm. MS Tunis: I.2:23, f. 2v:7]
الأفق[Plan. Sidoli+Berggren: 157(2), 166, 180, 274(2), 277, 283, 318]