Tísta

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

tísta

t, to twitter, of a small bird; to squeak, of a mouse; hestr, mús, titlingr … gneggjar, tístir, syngr, a ditty.

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