For other related logos and images, see:
Rai 3 was launched in December 1979 as Rete 3.
Rete 3 became Rai Tre in 1983. It launched a new logo corresponding with Rai's rebranding in the same year, which uses green as its color. In the bumpers, the logo was accompanied with a green three-sided tetrahedron.
Occasionally, there was a horizontal version of the logo. In this logo, the Rai Tre typeface was modified (as with the Rai corporate logo at that time) and the tetrahedron officially became part of the logo.
This logo, which drops the pyramid, uses Rai's newly-launched butterfly symbol, and maintains its now-standard green color, was introduced in 2000; during the TV shows it was all white until September 21, 2003, when it became white with a green halo around.
On May 18, Rai Tre changed name to Rai 3 (but is still called Rai Tre in a way since tre is Italian for three/3), introducing a new logo based on two squares, but keeping the same, historic color of the channel: green. Although the logo was introduced on May, they still used the 2003 idents until the new bumpers appeared on November of the same year that appeared in 16:9 instead of their predecessors.
On September 12, 2016, Rai 3, along with Rai 1, Rai 2, and Rai 4, redesigned its logo and launched a new graphics package. The new design of Rai 3's logo maintains Rai's corporate logo, drops the second square at the right and gives a slightly changed look for the number 3. The channel's iconic green color was maintained, albeit in a different shade.