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.

in potential ‘in potential’

English

References: Plan. Sidoli+Berggren: ?
Translation of:
Arabic: بالقوة [Plan. Sidoli+Berggren: 52, 53, 71, 75, 91, 189, 433]