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.

interval ‘interval’

English

References: Alm. Toomer: 39; 41; 48; 99
Translation of:
Greek: παραύξησις [Alm. Heiberg: II.7, 133:10; I.10, 31:12-13]
Greek: διάστημα [Alm. Heiberg: I.3, 12:2, I.5, 17:24]