ShowSpecialCharacters is an option for Style and Cell that specifies whether to replace \[Name], \:nnnn, etc. by explicit special characters.
SingleLetterItalics is an option for Cell that specifies whether single-letter names should be displayed in italics.
Smaller
(Built-in Mathematica Symbol) Smaller is a style or option setting that specifies that objects should be smaller.
Small
(Built-in Mathematica Symbol) Small is a style or option setting that specifies that objects should be small.
SpanAdjustments is an option for selections that specifies the height and width of spanning characters.
SpellingCorrection is an option for StringMatchQ, Names, and related functions that specifies whether strings should be considered to match even when a small fraction of the ...
SubscriptBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for selections that specifies settings for SubscriptBox objects.
SubsuperscriptBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for selections that specifies settings for SubsuperscriptBox objects.
SuperscriptBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for selections that specifies settings for SuperscriptBox objects.
TabSpacings is an option for character selections that specifies the number of spaces in ems that the cursor advances when the Tab key is pressed.