sq., square: sq. ft., square feet: sq. in., square inches: sq. m., square miles: sq. yds., square yards.
S.R.I. (L. sacrum Romanum imperium), the Holy Roman Empire.
s.s., steamship.
S.S.E., south-south-east.
S.S.W., south-south-west.
S.T.P. (L. sacræ theologia professor), Professor of Theology.
super., superfine.
supp., supplement.
S.W., south-west.
syn., synonym; synonymous.