A network's O&Os often share similar branding elements among themselves, reinforcing their common identity as stations owned by the same network; for example, a common shared element among O&O stations involves identifying themselves by combining the name of their parent network with the station's channel number (such as "CBS 2," which is uniformally used by CBS O&Os KCBS-TV in Los Angeles, WCBS-TV in New York City and WBBM-TV in Chicago), which started to become a normal mode of branding in the mid-1990s (beforehand, O&Os of certain networks – such as CBS and NBC – incorporated the network's logo into their own while verbally being referred under a more genericized channel branding). This kind of sharing may also present some savings to the parent network (i.e., the owner), as its O&Os can use the same graphics and music rather than to have each station commission their own individual branding package. Examples include the circle 7 logo (originally designed in 1962 for ABC's aforementioned O&Os, all of which at the time had broadcast on VHF channel 7) and the "I Love Chicago (Chicago My Home)" musical signature for local newscasts (originally used by WBBM-TV, and later spread to other CBS O&Os). Fox also has a set of branding guidelines for both its O&Os and affiliates. Supposedly, NBC and ABC also have branding guidelines for its affiliates, but not as extreme as CBS or Fox; since the 2013–14 season, however, when ABC unveiled an updated version of its logo, all of the network's affiliates are now required to use the ABC circle logo as a part of the station's own logo, which must additionally be approved by the network for use.