The logo design, especially the font (called "Westinghouse" or "Anklepants" (due to a similar typeface) by some people), was originally introduced when then-owner Westinghouse Broadcasting (Group W) introduced its design language in 1963.
In 2018, this iconic "4" was revived to celebrate its 70th anniversary.
The "CBS 4" name was abandoned in 2007 in favor of it's call letters. It similar to ITV1 logo which used 3 years earlier, but the color scheme slightly darker and the font is different. Their call letters and CBS logo are white
On December 12, 2011, WBZ adopted a new look and a new news set, at the same time switching to an amber-blue color scheme. This logo is formed from the combination of the "CBS 4" logo used from 2004–07 and the "WBZ" logo used from 2007-11.