When speaking on the telephone, it is sometimes useful to spell a word using English Phonetic Spelling. To spell "Club", for example, you would say: "C for Charlie, L for Lima, U for Uniform, B for Bravo."
It is very easy to learn English Phonetic Spelling. Start by spelling your name, then your company or address. Soon, you will know the whole alphabet. It also helps to remember that there are several groups of words that go together:
Dances: Foxtrot, Tango
Shakespeare: Romeo & Juliet
Men's first names: Charlie, Mike, Oscar, Victor
Cities: Lima, Quebec
The English Phonetic Spelling Alphabet is widely used by police and military organizations, including NATO. It is sometimes called the "NATO Phonetic Alphabet" but in fact it predates NATO by several decades. It is also sometimes called, wrongly, the "International Phonetic Alphabet".