Gosh darn it, am I using thorns in this account again?? I didn’t mean to.

I recently learned that only Icelandic does that. Eth was dropped early in old English, and thorn was used in both places. Additionally (as I understand it, now), while thorn was a direct “th” (voiced or unvoiced) sound, even when eth was in use it want orthographically a simple replacement for voiced “th”.

I guess Icelandic kept it, but eth was not in use through most of the old English, medieval period. And then the Normans came, and fucked written English completely up.