Plucked string, from Madeira (Portugal), (most likely) ancestor of the ukulele [apparently there's some people who suggest it's the cavaquinho instead].

Has five strings, and it's mostly used to accompany folk song and dance. 

https://www.wikidata.org/wiki/Q7285748

https://commons.wikimedia.org/wiki/Category:Raj%C3%A3o

https://www.metmuseum.org/art/collection/search/503738

https://saisaibatake.ame-zaiku.com/musical_instrument/gakki_jiten_rajao.html

https://saisaibatake.ame-zaiku.com/gakki/music1/rajao.gif