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.

great circle ‘great circle’

English

References: Alm. Toomer: 46; 69. – PH Hamm: I.3:1, 46:15
Translation of:
Greek: μέγιστος κύκλος [Alm. Heiberg: I.8, 29:4-5 ; I.14, 77:4-5. – PH Heiberg: I.3:1, 74:5]