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.

الدائم الخفاء ‘always invisible’

Arabic

References: Alm. MS Tunis: 22b.16-17
Translation of:
Greek: ἀεὶ ἀφανής [Alm. Heiberg: II.6, 103:4; II.6, 104:8; II.6, 117:6]
Synonyms:
أبديّ الخفاء[Alm. MS Leiden: f. 19v.26]
أبديّة الخفاء[Alm. MS Tunis: ]
الأبديّة الخفاء[Alm. MS Leiden: f. 17r]
الأبديّة الخفاء[Alm. MS Tunis: 26a.14]
دائم الخفاء[Alm. MS Tunis: 23a.1]
غائب أبدا[Alm. MS Leiden: f. 17r]