The rune ass, meaning
Aesir, i.e. the chief gods of
pagan Scandinavia, later oss, meaning rapids or
waterfall, from the Nordic rune alphabet. It was also carved
, probably a mixup, and .
A similar structure has been found on the neck of a man-shaped figure of a god painted on a rock face in the Sahara and said to be prehistoric. On that rock painting is associated with .
In the Viking age the sign was associated with the god Loke, something of a death god; with the mouth and with mouths in general, whether of rivers or other entities; and with signals.
The sign stands for Thursdays on the medieval clog almanacs.
Refer to , below, which, as well as , was sometimes carved .