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.

part ‘part’

English

References: Alm. Toomer: 49; 69; 70
Translation of:
Greek: τμῆμα [Alm. Heiberg: II.7, 125:12; I.10, 34; I.14, 77:10; I.14, 78]
Synonyms:
segment[Alm. Toomer: 94]