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.

ἡμιώριον‘half hour’

Greek. – Grammar: n.

References: Alm. Heiberg: II.7, 133:11
Translated into:
Arabic: نصف ساعة [Alm. MS Leiden: f. 22v.33. – Alm. MS Tunis: 29b.19]
Modern translations:
English: ½-hour [Alm. Toomer: 99]