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.

nature ‘nature’

English

References: PH Hamm: I.2:5, 46:13. – PH Morelon: I.2:5, 18:3
Translation of:
Greek: φύσις [PH Heiberg: I.2:5, 74:2]
Arabic: طبيعة [PH Morelon: I.2:5, 19:2]