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.

casting no shadow ‘shadowless’

English

References: Alm. Toomer: 83
Translation of:
Greek: ἄσκιος [Alm. Heiberg: II.6, 102:13; II.6, 105:7; II.6, 108:1; II.6, 108:5]
Synonyms:
shadowless[Alm. Toomer: 84]