Tönn

As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):

tönn Old Icelandic word can mean:

tönn

(gen. tannar, pl. tonn, tennr, teðr), f.

tönn

1) tooth; glotta um t., ör við t., to grin scornfully; rjóða t. á e-m, to redden one’s teeth on a person, to do one harm;

tönn

2) walrus-tusk; grafa t., to carve a tusk.

Possible runic inscription in Younger Futhark:ᛏᚢᚾᚾ