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.

ψιλός ‘bare’

Greek. – Grammar: adj.

References: PH Heiberg: I.2:4, 72:25
Translated into:
Arabic: منفرد [PH Morelon: I.2:4, 17:20]
Modern translations:
English: bare [PH Hamm: I.2:4, 46:10]