Che Guevara signed bank notes

Fidel Castro appointed Che Guevara as president of the National Bank of Cuba in 1959, and he didn’t sign his full name or with Dr.Che Guevara, instead he signed “Che”

Che is an Argentinean word  it is similar to English word “dude” his companion used to call him as “Che” so he was remembered as Che Guevara or Che