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.

angulus latitudinis‘the angle facing parallax in latitude in the triangle bound by the parallax on the circle of altitude, parallax in latitude, and parallax in longitude’

Latin. – Grammar: noun.

References: Alm. minor Zepeda: V.21