From The TV IV

A block refers to a group of television programs branded together under a common banner and placed adjoining each other on the network's schedule. The programs may share similar elements, such as the same format, style, or production company. Often the branding is done for ease of marketing. A block that airs on several days a week, in sequential order, is called a strip.

[edit] Notable Blocks

[edit] Single Day

• Kids WB!/The CW4Kids (The WB/The CW)
• Must See TV (NBC)
• Toonami (Cartoon Network)
• Cartoon Cartoon Fridays (Cartoon Network)
• FOX BOX/4Kids TV (FOX)
• TGIF (ABC)
• SNICK (Nickelodeon)
• Sci Friday (Sci Fi Channel)
• Cartoon Quest/The Animation Station (Sci Fi Channel)

[edit] Strips

• Miguzi (Cartoon Network)
• Adult Swim¹ (Cartoon Network)
• Nick Jr. (Nickelodeon)
• Nick at Nite¹ (Nickelodeon)
• The Disney Afternoon (Syndicated)
• Jetix² (Toon Disney/formerly ABC Family)
• Barbed Wire Biscuit/Midnight Spank (G4)

¹ This strip is counted as its own network by Nielsen Media Research.
² While Jetix technically started out as a strip that aired four hours a night, it has now expanded to the point where there is more Jetix programming on the Toon Disney channel than there is non-Jetix programming. Some speculate that the whole channel will eventually change to Jetix.