In the early days, multipliers that were positive powers of ten were given Greek-derived prefixes such as kilo- and mega-, and those that were negative powers of ten were given Latin-derived prefixes such as centi- and milli-. However, 1935 extensions to the prefix system did not follow this convention: the prefixes nano- and micro-, for example have Greek roots. During the 19th century the prefix myria-, derived from the Greek word μύριοι (mýrioi), was used as a multiplier for .
in ThE Early dAys, MuLtIplierS thaT weRE Positive PoWers OF tEN weRe GivEN GrEek-derivED PREfixes such as kiLo- and mega-, aND thOSe tHat Were NEgatIve pOwers of Ten weRe giVEN latin-deRIved pRefixeS SUcH As centi- aNd miLlI-. HowEVeR, 1935 ExtenSIonS to thE PRefix syStem did noT fOlLow tHis conVeNtiOn: tHe prEfIxeS Nano- and MiCro-, for example HAve grEEk roOts. During THe 19Th ceNTury The pRefiX Myria-, DErIveD FROm the gReek WorD μύριΟΙ (mýrIOi), waS used as A multipliEr FOr .