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.

ἰδίωμα ‘characteristic’

Greek. – Grammar: n.

References: Alm. Heiberg: II.1, 89:12; II.6, 101:7,10
Translated into:
Arabic: خَاصّ [Alm. MS Leiden: f. 14v; f. 16v. – Alm. MS Tunis: 19b.13; 22a.21,22]
Modern translations:
English: (special) characteristic [Alm. Toomer: 82]
English: particular [Alm. Toomer: 76]