From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :
SMLNJ
Standard Meta Language / New Jersey, "SML/NJ"
From The Free On-line Dictionary of Computing (30 December 2018) :
Standard ML of New Jersey
SML/NJ
(SML/NJ) An implementation of SML by Andrew Appel at
Princeton and Dave MacQueen at
AT&T. Version 0.93.
["Standard ML of New Jersey", A. Appel et al, "Proc Third Intl
Symp on Prog Lang Impl and Logic Programming", LNCS Springer
1991].
Versions for Unix, Mac. ftp://cs.yale.edu/pub/ml)">(ftp://cs.yale.edu/pub/ml),
ftp://research.att.com/dist/ml)">(ftp://research.att.com/dist/ml). Mailing list:
sml@cs.cmu.edu.