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.

Aquarius ‘Aquarius’

English

References: Alm. Toomer: 100-103; 376-9
Translation of:
Greek: Ὑδροχόος [Alm. Heiberg: II.8, 134-140; VIII.119-125]
Greek: Ὑδρηχόος [Alm. Heiberg: II.7, 124:3]