The phonetic alphabet, often called the military alphabet, gives every letter a code word so it can't be misheard over a radio or a bad phone line.
A Alfa · B Bravo · C Charlie · D Delta · E Echo · F Foxtrot · G Golf · H Hotel · I India · J Juliett · K Kilo · L Lima · M Mike · N November · O Oscar · P Papa · Q Quebec · R Romeo · S Sierra · T Tango · U Uniform · V Victor · W Whiskey · X X-ray · Y Yankee · Z Zulu