Þat-na

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

þat-na

that there, see -na; postulinn segir, ‘er þatna,’ is that there? is it? 623. 19.

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