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.

circle ‘circle’

English

References: Alm. Toomer: 46. – PH Hamm: I.2:3, 46:5; I.2:4, 46:8
Translation of:
Greek: κύκλος [Alm. Heiberg: I.8, 27:22:..; I.10, 34:5,14. – PH Heiberg: I.2:3, 72:20; I.2:4, 72:23]