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.

de même centre‘concentric’

French

References: PH Morelon: I.11:7, 38:28-29
Translation of:
Arabic: مركزه مركزه [PH Morelon: I.11:7, 39:19]
Synonyms:
(un cercle) dont le centre est celui de cet orbe[PH Morelon: I.3:2, 18:9-10]
tracé autour de son centre[PH Morelon: I.3:3, 18:13]