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.

Wege der Mechanik‘mechanical approach’

German

References: PH Nix: I.1:3, 71:24
Translation of:
Arabic: مذهب المخانيقي، وهي الحِيَل [PH Morelon: I.1:3, 15:13]