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.

τήρησις ‘observation’

Greek. – Grammar: n.

References: Alm. Heiberg: I.2, 9:15; I.6, 20:11
Translated into:
Arabic: مقياس [Alm. MS Leiden: I.2:26; f. 3r:31]
Arabic: قياس [Alm. MS Leiden: I.6:67, f. 4r:31]
Arabic: رَصْد  [Alm. MS Tunis: I.2:26, f. 2v:12; I.6:67, f. 4v:8]
Modern translations:
English: observation [Alm. Toomer: 38; 43]
Synonyms:
παρατήρησις[Alm. Heiberg: I.3, 10:5. – PH Heiberg: I.2:1, 72:9]