411 REFERENCE · Wiktionary
O. S.
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
Appendix:Variations of "os"
English
Noun
-
en OS.
en calendar systems en old style.
Anagrams
en os SO S/O s.o. so So So. S&O s/o S.O.