Since the invention of Morse messages, a uniform spelling alphabet has been used to avoid misunderstandings.  A good pilot should know it by heart.

Application examples would be e.g. the naming of grid squares, taxiways, parking stands etc.

English Alphabet

Alpha	Foxtrott	Kilo	Papa	Uniform	Zulu
Bravo	Golf	Lima	Quebec	Victor
Charlie	Hotel	Mike	Romeo	Whisky
Delta	India	November	Sierra	X-Ray
Echo	Juliette	Oscar	Tango	Yankee

English Numbers

The numbers are largely normal here as well. The 3 is spoken "Tree", since the English “Th” can be unclear over radio. Also, 4 is “Forwa”, 5 is “Fife” and 9 is spoken as “Niner”.

1 One	2 Two	3 Three (Tree)	4 Four (Forwa)	5 Five (Fife)
6 Six	7 Seven	8 Eight	9 Nine (Niner)	10 One Zero

Further information:

• Wikipedia: Spelling Alphabet
• NATO phonetic alphabet, codes and signals