Rongorongo has roughly double that number of glyphs. The descendant (Rapa Nui) of the language it encodes is still spoken, and there's a whole family of relat

Rongorongo has roughly double that number of glyphs. The descendant (Rapa Nui) of the language it encodes is still spoken, and there's a whole family of related languages. But we haven't made much headway in deciphering it. Linear A has one advantage though: we have some understanding of how the script works, and can (or think we can) pronounce parts of the text. There's also Etruscan, which is partially deciphered (about 250 words are understood with any certainty), but it has no surviving relatives and only a couple of bilingual texts, one very short and the other not a literal translation of the known language. So all we have to go on is textual and archaeological context.