Phonetic Alphabet

This is a well known code (used by NATO).  It is used by many people for different reasons but usually to clarify the spelling of names, places etc.
A Alpha

B Bravo

C Charlie

D Delta

E Echo

F Foxtrot

G Golf

H Hotel

I India

J Juliet

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
 
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Ref:  http://www.osric.com/chris/phonetic.html