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Thank you @donnadavisart!! :)
Yes, Otto is right. It's a lime leaf and the legend of Siegfried.

it is a lime leaf (Linde in German) - tilia europaea - and in this context, it refers to the Siegfried legend.

not that well known actually - the lime (Linde) leaf. You won't find it in wikipedia, but I have a old book of German Mythology and it is found in there.

Oh I love lime, especially an allee of them! Thanks for that. I'm looking up the german mythology and lime now! :)