Just to preface : I couldn't play an instrument if my life depended on it. Likewise, I know little to nothing about the technical aspects of instruments (let alone being able to read / understand music) , so I'll defer the nitty-gritty to the accompanying link.
With that out of the way - here's one of the coolest guitars EVER : the White-Parsons B-Bender . I've seen countless videos of the late Clarence playing his invention (innovation ?) with The Byrds. Then I saw Marty Stuart & His Fabulous Superlatives (fantastique band ! Forget about it !) on 15-4-2022. Now, Marty owns/curates the original B-Bender as owned by Clarence, purchased from White's widow in c.1980 by Stuart.
B-Bender - Wikipedia