HoldForm[expr] prints as the expression expr, with expr maintained in an unevaluated form.
Hold
(Built-in Mathematica Symbol) Hold[expr] maintains expr in an unevaluated form.
HoldPattern[expr] is equivalent to expr for pattern matching, but maintains expr in an unevaluated form.
HoldRest is an attribute which specifies that all but the first argument to a function are to be maintained in an unevaluated form.
HornerForm[poly] puts the polynomial poly in Horner form.HornerForm[poly, vars] puts poly in Horner form with respect to the variable or variable list ...
HotellingTSquareDistribution[p, m] represents Hotelling's T^2 distribution with dimensionality parameter p and m degrees of freedom.
HoytDistribution[q, \[Omega]] represents a Hoyt distribution with shape parameter q and spread parameter \[Omega].
Hue
(Built-in Mathematica Symbol) Hue[h] is a graphics directive which specifies that objects which follow are to be displayed, if possible, in a color corresponding to hue h. Hue[h, s, b] specifies colors in ...
HumpDownHump[x, y, ...] displays as x \[HumpDownHump] y \[HumpDownHump] ....
HumpEqual[x, y, ...] displays as x \[HumpEqual] y \[HumpEqual] ....