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Originally Posted by mhardy6647
u is the 'transliteration' of the Greek letter "mu", which is the abbreviation for 'micro'.
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See the Greek letter "M" in the Greek alphabet:
http://www.mathekiste.de/griechischesalphabet.htm
u for Greek "my" is not correct, but it is similar to "X" for Greek "Chi", while the corresponding Greek letter for Latin "X" is "Xi".
Eckhard