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.

Mars ‘Mars’

English. – Grammar: n.

References: PH Hamm: I.12:1, 57:20
Translation of:
Greek: Ἄρης [PH Heiberg: I.12:1, 94:7]
Synonyms:
the star of Mars[PH Hamm: I.7:3, 49:13]