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In English-language papers, I often see "dc" (as in direct current) in lowercase, but "RF" (as in radio frequency) in uppercase. For example, this paper includes both usages at the bottom of page 618: This means that the ac (RF) waveform applied to [...] Some more papers using "dc". http://instructor.physics.lsa.umich.edu/adv-labs/Mass_Spectrometer/MassSpecQMS.pdf http://www.vacuumcursus.nl/casussen/jcequad.pdf http://ir.gig.ac.cn:8080/bitstream/344008/13774/1/08018.pdf Oddly, this one uses lowercase "dc" and "rf": http://www.stanford.edu/group/Zarelab/publinks/798.pdf Where does this convention stem from?
capitalization
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