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.

κύκλος‘ring’

Greek. – Grammar: n.

References: Alm. Heiberg: I.12, 64:12
Translated into:
Arabic: حلقة [Alm. MS Leiden: f. 10v]
Arabic: دائرة [Alm. MS Tunis: ]
Modern translations:
English: ring [Alm. Toomer: 61]