Expressed in words, this is equal to zero point nine.
If you write September 09 2009 as 09-09-2009 then you can write using these numerals IX (9) and MM = 2000, so 09-09-2009 becomes IX.IX.MMIX
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09 or just plain '9' is 'IX'. 1 = I 2 = II 3 = III 4 = IV ( or IIII) 5 = V 6 = VI 7 = VII 8 =VIII 9 = IX 10 = X 11 = XI 12 = XII As found on the dials(faces) of Classical Clocks. NB In Roman Numerals , the highest value letter is ALWAYS to the left. Except when a lower value letter is placed to the left of a higher value letter, then subtract. Hence X = 10 XI = 10 + 1 = 11 IX = 10 - 1 = 9 Similarly for all other letters.
.09 percent = .0009 = 9/10000.
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09= ix 22= xxii 1986= mcmlxxxvi
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0.9