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 A.2.12

Ptolemy
Quadripartitum (tr. Valentin Nabod)

This translation is part of Valentin Nabod’s In Claudii Ptolemaei Quadripartitae constructionis apotelesmata commentarius novus et eiusdem conversio nova. See C.2.30.