PAL

Ptolemaeus Arabus et Latinus

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% (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.

دائرة نصف النهار ‘meridian (circle)’

Arabic

References: Alm. MS Tunis:
Translation of:
Greek: μεσημβρινὸς (κύκλος) [Alm. Heiberg: I.8, 29:23]
Synonyms:
فلك نصف النهار[Alm. MS Leiden: f. 6r]