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.

منفرد ‘bare’

Arabic

References: PH Morelon: I.2:4, 17:20
Translation of:
Greek: ψιλός [PH Heiberg: I.2:4, 72:25]
Modern translations:
French: détaillé par élément [PH Morelon: I.2:4, 16:36]
German: einfach [PH Nix: I.2:4, 73:36]