I think this should be labelled:
Rua Sílvio Tibiriçá
(Note accents and capitalisation.)
It's named after Sílvio Tibiriçá de Almeida. The street sign seems to be missing the first acute accent. The sign looks extremely old and I think it's just a mistake that never got fixed because it's just a sign in a low income housing area and no one cares.