the.com/nyckelharpa

means A traditional Swedish stringed instrument played with a bow, where keys pressed under the strings stop them to change pitch, producing a resonant, droning sound.

from From Swedish, a tidy compound of nyckel ('key') and harpa ('harp' or, more loosely, a stringed instrument) — so literally 'key-harp.' Nyckel descends from the same Germanic root that gives English 'nail' a distant cousinhood and shares kinship with German Schlüssel only by function, not form. Harpa is the broad old Germanic word for plucked or strung things, related to English 'harp.' The instrument itself has been played in Sweden for centuries, with keyed fiddles depicted in medieval church carvings, though the name simply describes what you see: a stringed thing operated by keys.