Rai 3 is part of Rai, the Italian government broadcasting agency, which owns other channels, such as Rai 1 and Rai 2 (amongst others). Rai 3 first started transmissions on 15 December 1979.
Link to the Official Rai 3 Website
Rai 3 2010 to 2016 Idents & Presentation
On May 18, Rai Tre was rebranded to Rai 3, a new logo based on two squares was introduced, initially the existing presentation was retained, the branding was introduced in November of the same year.