LessFullEqual[x, y, ...] displays as x \[LessFullEqual] y \[LessFullEqual] ....
LessGreater[x, y, ...] displays as x \[LessGreater] y \[LessGreater] ....
LessLess[x, y, ...] displays as x \[LessLess] y \[LessLess] ....
LessSlantEqual[x, y, ...] displays as x \[LessSlantEqual] y \[LessSlantEqual] ....
LessTilde[x, y, ...] displays as x \[LessTilde] y \[LessTilde] ....
Log10
(Built-in Mathematica Symbol) Log10[x] gives the base-10 logarithm of x.
LongLeftArrow[x, y, ...] displays as x\[LongLeftArrow]y\[LongLeftArrow]....
LongLeftRightArrow[x, y, ...] displays as x\[LongLeftRightArrow]y\[LongLeftRightArrow]....
LongRightArrow[x, y, ...] displays as x\[LongRightArrow]y\[LongRightArrow]....
LowerLeftArrow[x, y, ...] displays as x \[LowerLeftArrow] y \[LowerLeftArrow] ....