The History Channel
HD logo introduced in 2007, when during the time HDTV's were starting to get introduced.
In early 2013, use of the HD logo on the HD feed was phased out.
An updated logo debuted on June 1, 2015. This update removes the arrow beside it, and gives the H more texture.
On June 13, 2016, The History Channel changed their profile picture on social media to a rainbow version of their logo in tribute to the victims of the then-recent Orlando nightclub shooting