Herðsla

Meaning of Old Norse word "herðsla"

As defined by the Cleasby & Vigfusson Old Norse to English dictionary:

herðsla

u, f. hardening, tempering, of iron.

Possible runic inscription in Younger Futhark:ᚼᛁᚱᚦᛋᛚᛅ
Younger Futhark runes were used from 8th to 12th centuries in Scandinavia and their overseas settlements