Jumis/yumis.I used to believe that Jumis brings you good luck.
It is, for example, two cherries grown together from a single stem or two nuts in the same shell. It can be any thing in nature that has a twin. If you find it you are supposed to keep it in your house so that the next harvest would be better.
When I was a kid, I used to dig through the whole bowl of grandma's cherries just to find it. There was always at least one. If I managed to find two, I kept the other one ''as backup''.
I also thought that if I didn't have a flower crown in my hair for Jāņi, the entire world would implode.