Background

I:

• 
  is the ninth letter of the English alphabet
  
• 
  is derived from the ninth letter of the Greek Alphabet, Iota
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  is the fifth most common used letter in the english language
  
• 
  scores one point in scrabble and there are nine I tiles in a scrabble set.
  

Pronunciation

'I' can be pronounced as in 'time', short as in 'sit' and other, less common, ways like the 'ee' sound in 'police' and as part of the 'shun' sound in 'station'

I And It's Uses

The letter I on its own can be used in all manner of applications

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  As a pronoun, refering to one's self, as in "I am walking"
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  As the chemical symbol for Iodine.
  
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  As a roman numeral, meaning one.