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.

difference ‘difference’

English

References: Alm. Toomer: 51; 54; 78
Translation of:
Greek: ὑπεροχή [Alm. Heiberg: I.10, 38:17; I.10, 42:15]
Greek: διάφορον [Alm. Heiberg: II.3, 94:1-2]