On May 22, 1956, NBC started using a logo for their color programming. The original peacock is a lucky find today. In 1962, they changed the logo. On a kaleidoscopic background, a majestic tune plays, as the NBC peacock fans its feathers and then turns into the logo from before.
The chimes were rendered obsolete by 1960 as a new logo, dubbed the "NBC snake", arrived. There are some variants of it but the most famous is the one where it draws itself.
This short-lived abstract N logo was first unveiled on October 1975 and premiered on-air January 1, 1976. Nicknamed the "Trapezoid N". This logo was dropped as a result of a lawsuit by a public television broadcaster in Nebraska for potential copyright issues.
This is shown with or without the stylized "N"; although the version without the "N" was rarely seen after 1980. The network had, by this time, decided to take a new approach in its programming to introduce the slogan, "NBC - Proud As A Peacock!". Nicknamed the "Proud N".
A new logo, created by Chermayeff & Geismar, was finally launched on May 12, 1986. Chermayeff & Geismar are also responsible for the logos of PBS, Chase Manhattan Bank, Screen Gems Television, and others. This remains use as the on-screen bug.
In May 2011, NBC altered and modified their logo slightly to feature bevels and gradients. Other aspects of the 2009 graphics package remained intact.
In April 2013, NBC altered and modified their 3D logo.
To see more stuff from NBC go here: NBC/Others.