Itself is from "pagan era" meaning from time
before christianity. It was a symbol people used
as a protection against evil. By using it in
jewellery or as a symbol carved or drawn on
buildings it protected not only people but
cattle, homes etc.
Hannun Vaakuna might have come to Finland from
Germany, that's not 100% sure but very likely.
You may find Hannun vaakuna�s symbols in
medieval churches as well (some symbols etc.
from non-christian era were painted on the walls
side by side with christian symbols, one of the
best examples of this "primitive" style is
Marian kirkko (Church of Virgin Mary) in a place
called Maaria near Turku;
There is so called Jatulin tarha symbol, spiral-
like labyrinth figure). Kalevala koru uses
Hannun vaakuna in their jewellery and models for
the older types of Kalevala koru are taken from
old jewellery (bronze-age) found in Finland. 
