Nos.
See also: Appendix:Variations of "nos"
English
editEtymology
editFrom No. + -s as a nautralization in English irrespective of any New Latin morphology (analogous to the informal variants lbs, bbls, kgs, kms, and MPGs).
Noun
editNos.
Usage notes
editThe form Nos. (as with lbs) has been very widely used in English, regardless of any prescriptions that it ought not to be. However, formal writing usually avoids pluralized symbols for units of measure (for example, in SI style a unit symbol does not inflect, so "5 cm" is considered correct).