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.

κοινὸν (σημεῖον)‘intersection’

Greek. – Grammar: adj.

References: Alm. Heiberg: II.7, 126:18,21
Translated into:
Arabic: (نقطة) مستركة  [Alm. MS Tunis: 28a.16,17]
Arabic: حيث يشترك [Alm. MS Leiden: f. 21r.38,39]
Modern translations:
English: intersection [Alm. Toomer: 95]
Synonyms:
τμῆμα[Alm. Heiberg: II.6, 102:11-12]
τομή[Alm. Heiberg: II.7, 121:15; II.7, 125:8; I.14, 76:23]