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.

على أقرب ما يكون من الحقيقة‘approximation’

Arabic

References: PH Morelon: I.5:1, 21:14
Translation of:
Greek: συνεγγισμὸς (κατά συνεγγισμόν) [PH Heiberg: I.5:1, 76:23]
Modern translations:
French: le plus adéquatement possible [PH Morelon: I.5:1, 20:22]
German: möglichst angenähert an ihre wirkliche [PH Nix: I.5:1, 77:26-27]