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.

Work B.1.6

Pseudo-Ptolemy
Centiloquium (tr. before c. 1250)

This translation is part of Abuiafar Hamet filius Joseph’s commentary on the Centiloquium in the anonymous translation made before c. 1250. See C.3.1.5.