AIm no pro but at a guess id say its to emboss icing. Hth
Might be a docking rolling pin. Some old world rolling pins were meant for hard doughs or crackers to dock them.
It's called a nobbed, embossed, or notched rolling pin, and is used to imprint designs into dough or clay. I have a similar pin and use it for specialty gingerbread houses during the holiday season.
Thank you. We have never seen a rolling pin like this before. We have a couple that have designs in for when we make Springerle cookies, but not this. Do you know if there's a reason why it has three sections on the roller instead of one piece?