RTP2 was launched on December 25, 1968, occupying two hours of RTP1's schedule during the night time. Despite this, there was no official logo for the network since the logo used was the main RTP logo and in order to distinguish the two channels and though RTP2 was the legal name, the channel had to be identified as II Programa until 1978.
RTP2 (first era)
In October 18th, 1983, the third logo of this year was lauched.
In March 7th, 1984, in the anniversary of RTP, both channels (RTP1 and RTP2) had received new idents.
In late 1985, a new logo was adopted. The logo contains a red 2 drawn out of three lines and the RTP wordmark in blue underneath. Network ID
RTP Canal 2
In September 1989, RTP2 was renamed as RTP Canal 2.
RTP2 (second era)
In September 17th 1990, RTP Canal 2 was reverted back to RTP2 as the channel changed its logo. The logo has a white "2" with RTP words on the right.
In September 14th 1992, RTP2 became TV2. The logo has a silver "TV" words with the yellow ribbon forming a "2".
RTP2 (third era)
In April 22nd 1996, TV2 was renamed again as RTP2. The logo had a yellow box with the number "2" inside with the "RTP" words on the bottom. (different for RTP1).
Same as the RTP1, RTP2 had a slight update in October 12th 1998.
In January 28th, 2002, RTP2 gets a new look. The box and the "RTP" words were retired from the logo, and the "2" became dark red (white during on-air).
As part of the restructuring plan for the RTP group in 2003, RTP2 was relaunched as 2: (a dois, the two in english), also know as A Dois, in January 5, 2004. The logo was designed by Brandia Central. The new channel was fully dedicated to civil society and operated by RTP. The 2: has 14 squares forming a "2" and 2 squares forming a ":". 
RTP2 (fourth era)
In March 19, 2007, A Dois was renamed again as RTP2. The logo was very different than the RTP1.
Identity designed by Brandia Central.
On May 9th, the channel introduced its new look at 21:00 (GMT).
- For other related logos and images see: RTP2/Other