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.

كوكب عطارد‘Mercury’

Arabic

References: PH Morelon: I.7:1, 23:15
Translation of:
Greek: ὁ τοῦ Ἑρμοῦ ἀστήρ [PH Heiberg: I.7:1, 78:16]
Modern translations:
French: Mercure [PH Morelon: I.7:1, 22:16]
German: das Gestirn Merkur [PH Nix: I.7:1, 79:15]
Synonyms:
عطارد[PH Morelon: I.10:1, 33:2]