This logo is essentially its 1972 film counterpart, but includes a ring reading "TELEVISION", much akin to the logos that its parent company Warner Bros. had used from 1948 to 1967 and would use from 1984 onward.
A different logo was used that featured a lighter colored shield with its ring reading "WARNER BROS. TELEVISION" on a different cloud background, with the Time Warner Entertainment byline appearing below it (appearing slightly three-dimensional along with the letters on the ring) in a slightly different shade of yellow.
Whose Line is it Anyway? (1998)
Rare widescreen version.
Same rare widescreen version as before, but in 4:3 aspect ratio.
Same as the 1984, 1990 and 1992 logos, only with the ring reading "WARNER BROS. TELEVISION" instead of "WARNER BROS. PICTURES" (much akin to the 1994 logo) and a URL reading "www.warnerbros.com" placed underneath the Time Warner Entertainment byline. It had only appeared for a short time before Time Warner merged with America Online, which owned Time Warner before it got the "Aol." logo in 2009.
This logo is basically the closing version of its 2001 film counterpart, only with the ring reading "WARNER BROS. TELEVISION". Occasionally, the "www.warnerbros.com" URL would appear beneath the AOL Time Warner byline.
Same as the 2001 and 2003 logos, but only the shield and cloud background are redone. The shield is also 3D and made to look more like the shield from the theatrical logo, and it is a little more shiny.
Later in summer 2018, the shield is now zooming in closer and the cloud are now moving left.
Warner Bros Television Logo (1955)
The Corddry Company-Abominable Pictures-WB Studios 2.0-Warner Bros. TV-Williams Street (2016)