SubPlus
(Built-in Mathematica Symbol) SubPlus[expr] displays as expr_+.
Subresultants[poly_1, poly_2, var] generates a list of the principal subresultant coefficients of the polynomials poly_1 and poly_2 with respect to the variable var.
SubscriptBox[x, y] is the low-level box representation for x_y in notebook expressions.
SubscriptBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for selections that specifies settings for SubscriptBox objects.
Subscript[x, y] is an object that formats as x_y. Subscript[x, y_1, y_2, ...] formats as x Subscript[y, 1], Subscript[y, 2], ....
SubsetEqual[x, y, ...] displays as x \[SubsetEqual] y \[SubsetEqual] ....
Subset
(Built-in Mathematica Symbol) Subset[x, y, ...] displays as x \[Subset] y \[Subset] ....
Subsets
(Built-in Mathematica Symbol) Subsets[list] gives a list of all possible subsets of list. Subsets[list, n] gives all subsets containing at most n elements. Subsets[list, {n}] gives all subsets containing ...
SubStar
(Built-in Mathematica Symbol) SubStar[expr] displays as expr_*.
x_y^z is the low-level box representation for x_y^z in notebook expressions.