London's most popular sport is football and it has fourteen League football clubs, including five in the Premier League: Arsenal, Chelsea, Crystal Palace, Tottenham Hotspur, and West Ham United. Among other professional teams based in London include Fulham, Queens Park Rangers, Millwall and Charlton Athletic. In May 2012, Chelsea became the first London club to win the UEFA Champions League. Aside from Arsenal, Chelsea and Tottenham, none of the other London clubs have ever won the national league title.
How many professional football clubs call London their home?
fourteen

Since the formal adoption of digital video broadcasting's (DVB) widescreen HDTV transmission modes in the early 2000s; the 525-line NTSC (and PAL-M) systems, as well as the European 625-line PAL and SECAM systems, are now regarded as standard definition television systems.
525 and 625-line systems are now considered what?
standard definition television systems

The term Muslim world, also known as Islamic world and the Ummah (Arabic: , meaning "nation" or "community") has different meanings. In a religious sense, the Islamic Ummah refers to those who adhere to the teachings of Islam, referred to as Muslims. In a cultural sense, the Muslim Ummah refers to Islamic civilization, exclusive of non-Muslims living in that civilization. In a modern geopolitical sense, the term "Islamic Nation" usually refers collectively to Muslim-majority countries, states, districts, or towns.
When speaking of religion, what does Ummah refer to?
those who adhere to the teachings of Islam