Left arrows - LaTeX symbols

Symbol Command
$\gets$ \gets
$\larr$ \larr
$\leftarrow$ \leftarrow
$\longleftarrow$ \longleftarrow
Symbol Command
$\Larr$ \Larr
$\lArr$ \lArr
$\Leftarrow$ \Leftarrow
$\impliedby$ \impliedby
$\Longleftarrow$ \Longleftarrow
Symbol Command
$\leftleftarrows$ \leftleftarrows
Symbol Command
$\leftharpoonup$ \leftharpoonup
$\leftharpoondown$ \leftharpoondown
Symbol Command
$\hookleftarrow$ \hookleftarrow
$\looparrowleft$ \looparrowleft
$\Lsh$ \Lsh
Symbol Command
$\dashleftarrow$ \dashleftarrow
Symbol Command
$\twoheadleftarrow$ \twoheadleftarrow

Extensible left arrows in LaTeX

Symbol Command
$\xleftarrow{something}$ \xleftarrow{something}
$\xLeftarrow{something}$ \xLeftarrow{something}
$\xleftharpoonup{something}$ \xleftharpoonup{something}
$\xleftharpoondown{something}$ \xleftharpoondown{something}
$\xhookleftarrow{something}$ \xhookleftarrow{something}
$\xtwoheadleftarrow{something}$ \xtwoheadleftarrow{something}

Not left arrows in LaTeX

Symbol Command
$\nleftarrow$ \nleftarrow
$\nLeftarrow$ \nLeftarrow

LaTeX arrow

LaTeX