Ludwig Koehler and Walter Baumgartner interpret גִּלָּיוֹן in Isaiah 8:1 as a reference to a tablet made of metal, wood, or leather.
Ludwig Koehler and Walter Baumgartner, "גִּלָּיוֹן," The Hebrew and Aramaic Lexicon of the Old Testament (Leiden: Brill, 1995) (Bibleworks ed.)
1787 גִּלָּיוֹן
גִּלָּיוֹן: גלה, BL 498c; MHb. open margin of parchment scroll, Syr. gelyaÒnaÒ/yaÒnaÒ )Heb.( revelation: pl. ) גִּלְיֹנִיםBL 498d(; Kuhn BhZNW 26:24ff:
—1. Is 323 together with ï סְדִינִים; Sept. βύσσινα fine, transparent garments :: Galling ZDPV 56:2 11f: papyrus garments, Hönig Bekleidung 118; trad. mirror Tg. Vulg.;
—2. Is 81 גָּדוֹל גִּ׳ tablet )cf. לוּחַ 308(, made of metal, wood or leather )ï Comm.( :: Galling )vs.( papyrus )rd. גּוֹרָל גִּ׳ “all-purpose sheet”). †