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.
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At the beginning and at the end, these placeholders are superfluous.

(مثلث) القائمة الزاوية  ‘right-angled (triangle)’

Arabic

References: Alm. MS Leiden: f. 7r
Translation of:
Greek: ὀρθογώνιον (τρίγωνον) [Alm. Heiberg: I.10, 40:9]
Synonyms:
(مثلث) القائم الزاوية [Alm. MS Tunis: ]