Happy Winter Solstice!
Pronounced, Nee-sa: A nisse (Danish: [ˈne̝sə], Norwegian: [ˈnɪ̂sːə]), tomte(Swedish: [ˈtɔ̂mːtɛ]), tomtenisse, or tonttu (Finnish: [ˈtontːu]) is a mythological creature from Nordic folklore today typically associated with the winter solstice and the Christmas season. They are generally described as being short, having a long white beard, and wearing a conical or knit cap in red or some other bright color. They often have an appearance somewhat similar to that of a garden gnome.
The nisse is one of the most familiar creatures of Scandinavian folklore, and he has appeared in many works of Scandinavian literature. With the romanticization and collection of folklore during the 19th century, the nisse gained popularity.
Source: https://en.m.wikipedia.org/wiki/Nisse_(folklore)