HeldGroupHe[] represents the sporadic simple Held group He.
ImportAutoReplacements is an option for cells that specifies which replacement rules Mathematica automatically applies when importing text.
LeftArrow[x, y, ...] displays as x \[LeftArrow] y \[LeftArrow] ....
LeftRightArrow[x, y, ...] displays as x \[LeftRightArrow] y \[LeftRightArrow] ....
LeftRightVector[x, y, ...] displays as x\[LeftRightVector]y\[LeftRightVector]....
LeftVector[x, y, ...] displays as x \[LeftVector] y \[LeftVector] ....
LineBreakWithin is an option for selections that specifies whether line breaks occur automatically when the end of a line is reached.
Medium
(Built-in Mathematica Symbol) Medium is a style or option setting that specifies that objects should be medium sized.
MorphologicalBranchPoints[image] gives a version of a binary image image in which white pixels represent the morphological branch points.
NotGreaterSlantEqual[x, y, ...] displays as x \[NotGreaterSlantEqual] y \[NotGreaterSlantEqual] ....