The C band is a name given to certain portions of the electromagnetic spectrum, including wavelengths of microwaves that are used for long-distance radio telecommunications. The IEEE C-band (4 GHz to 8 GHz) - and its slight variations - contains frequency ranges that are used for many satellite communications transmissions, some Wi-Fi devices, some cordless telephones, and some weather radar systems. For satellite communications, the microwave frequencies of the C-band perform better under adverse weather conditions in comparison with K_u band (11.2 GHz to 14.5 GHz) microwave frequencies, which are used by another large set of communication satellites. The adverse weather conditions, collectively referred to as rain fade, all have to do with moisture in the air, including rain and snow.

The NATO C-band is that portion of the radio spectrum between 500 megahertz (MHz) and 1000 MHz, but this terminology is rarely used in the NATO members that are located in North America.

The IEEE C-band is a portion of the electromagnetic spectrum in the microwave range of frequencies ranging from 4.0 to 8.0 gigahertz (GHz), but this definition is the one that is followed by radar manufacturers and users, but not necessarily by microwave radio telecommunications users.

Serie A (Italian pronunciation: [ˈsɛːrje ˈa]), also called Serie A TIM due to sponsorship by Telecom Italia, is a professional league competition for football clubs located at the top of the Italian football league system and has been operating for over eighty years since the 1929-30 season. It had been organized by Lega Calcio until 2010, but a new league, the Lega Serie A, had been created for the 2010–11 season. Serie A has produced the highest number of European Cup finalists: Italian clubs have reached the final of the competition on a record twenty-six different occasions, winning the title twelve times. Serie A is ranked 4th among European leagues according to UEFA's league coefficient behind the English Premier League, Spanish La Liga, and German Bundesliga, which is based on the performance of Italian clubs in the Champions League and the Europa League. It also ranked 5th in world according to the first trends of the 2011 IFFHS rating.

In its current format, the Italian Football Championship was revised from having regional and interregional rounds, to just one solid league from the 1929–30 season onwards; the Serie A system carries on today. The championship titles won before 1929 are officially recognised by FIGC as a championship in the same way the ones since then are. The 1945–46 season, when the league was played over two geographical groups due to WWII destructions, is not statistically considered, even if its title is fully official.