one
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1 way to spell - FOUR
1-um
It is 1 letter, L=50.
The number "one" should normally be written out. The numeral would be used if there was a larger number in the same reference, such as the phrase "1 out of every 100 drivers".
The number 1000 is "one thousand." You may be seeking the number 1/1000, which is "one thousandth" or "one one-thousandth."