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.

perigee ‘perigee’

English

References: Alm. Toomer: 151. – PH Hamm: I.9:6, 52:7
Translation of:
Greek: περίγειον [Alm. Heiberg: III.3, 229:21. – Handy Tables: 174:9. – PH Heiberg: I.9:6, 84:6]