[Info-ingres] Micro-madness

[nikosv]

U+03BC is Greek alphabet letter - Greek Small Letter Mu
U+00B5 is a symbol - Micro sign 

If you check the Unicode Script section  at 

https://www.compart.com/en/unicode/U+03BC
https://www.compart.com/en/unicode/U+00B5

the former resides in "Greek" script,
the latter in "Code for undetermined" script.

As such the latter is not considered part of the Greek language/alphabet but a mere symbol,
 "unit prefix in the metric system denoting a factor of 10−6 "