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.

ratio ‘ratio’

English

References: Alm. Toomer: 43; 54. – PH Hamm: I.8:1, 50:5
Translation of:
Greek: λόγος [Alm. Heiberg: I.6, 20:3, 5; I.10, 43:8. – PH Heiberg: I.8:1, 80:6]