When using an abbreviation or acronym that has a mix of lowercase and capital letters, such as mmWave or dBm, in a heading or line that is formatted in all caps, is it appropriate to use all caps - or should you leave the mixed caps?
is it appropriate to use all caps - or should you leave the mixed caps?
Leave the mixed capitals!
From the IEEE website APPENDIX VII Recommended Unit Symbols, SI Prefixes, and Abbreviations:
M = mega, e.g. 20MW = twenty million Watts,
m = milli e.g. 20mW = twenty milliwatts = 0.02 Watts