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.

um den Mittelpunkt derselben gelegen ‘concentric’

German

References: PH Nix: I.3:3, 75:18
Translation of:
Arabic: مخطوط على مركزه [PH Morelon: I.3:3, 19:10]
Synonyms:
(ein Kreis) dessen Mittelpunkt der Mittelpunkt dieser Sphäre ist[PH Nix: I.3:2, 75:12]
dessen Mittelpunkt sein Mittelpunkt ist[PH Nix: I.11:7, 93:12-13]