NonNegative[x] gives True if x is a non-negative number.
OverDot
(Built-in Mathematica Symbol) OverDot[expr] displays with a dot over expr.
Postfix
(Built-in Mathematica Symbol) Postfix[f[expr]] prints with f[expr] given in default postfix form: expr // f. Postfix[f[expr], h] prints as exprh.
Prefix
(Built-in Mathematica Symbol) Prefix[f[expr]] prints with f[expr] given in default prefix form: f@expr. Prefix[f[expr], h] prints as hexpr.
PrintingCopies is an option for notebooks that specifies the number of copies of a notebook printed when a print command is given.
PrivateFontOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for selections that specifies settings for various font suboptions.
RadicalBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for selections that specifies settings for RadicalBox objects.
RandomImage[max, {w, h}] gives an image of dimensions {w, h} with pseudorandom pixel values generated from a uniform distribution in the range 0 to max.RandomImage[{min, ...
Saveable is an option for notebooks that specifies whether a notebook can be saved.
SaveAutoDelete is an option for ErrorBox objects that specifies whether the ErrorBox is automatically deleted when the notebook containing it is saved.