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.

in gleichmäßiger Bewegung‘with a uniform speed’

German

References: PH Nix: I.8:3, 81:14-15; I.10:10, 89:18-19
Translation of:
Arabic: حركة مستوية [PH Morelon: I.8:3, 27:8]
Arabic: مسير مستوي [PH Morelon: I.10:10, 35:19]
Synonyms:
in gleichmäßig schneller Bewegung[PH Nix: I.3:2, 75:14]