Do Mandaic's irregularly named letters (halqa, ushenna, it, aksa, in, ash) carry an inherited sense, or are they labels of a different kind?
Most Mandaic letters are named by their own sound with a preceding a (ab, ag, ad...), and their own descriptions state plainly this is a pronunciation label rather than an inherited word with a sense, unlike the Northwest Semitic nouns Hebrew and Syriac kept for the same slots. Six letters break that regular pattern by their own descriptions' own account (Its own text names the set: ushenna, aksa, dushenna, kad and it itself; In and Ash are separately marked as built on a different vowel or sound), and Dushenna and Kad, two of the six, already carry attested senses because they are documented ligatures of a real Aramaic word. The other four, plus Halqa, the very first letter and one of the script's three true vowel signs, whose name is equally outside the regular pattern, have no sense offered by any source consulted, and none of their descriptions states this as a settled absence either.
What would resolve this A study of Mandaic's own manuscript and liturgical tradition for these specific six names, checked against Mandaic vocabulary and against the older Aramaic sequence's inherited nouns for the same six slots (Aleph, Waw, Heth, Yod, Ayin, Shin), beyond what the general reference literature already surveys.
Mandaic studies; comparative Aramaic philologyThe Unicode Consortium, The Unicode Standard
Did the Mandaic letters ever carry numeric values in the Semitic alphanumeric manner?
Hebrew, Syriac and Arabic all use their letters as figures, and Mandaic descends from the same Aramaic stock, so the practice would be unremarkable. No alphanumeric numeral system for Mandaic is described in the reference literature consulted, and the modern character standard encodes no Mandaic digits. Nothing states that the practice was absent either, so this is a gap rather than a disagreement.
What would resolve this A survey of numbering in dated Mandaean manuscripts and inscribed lead rolls, checking colophons, quire marks and folio numbers for letters standing as figures, together with a reading of the standard Mandaic grammars on how numbers are written out.
Semitic palaeography and Mandaean manuscript studiesThe Unicode Consortium, The Unicode Standard