\overleftharpoon{ac}The command \overleftharpoon{ac} is used to place a left-pointing harpoon accent over the characters 'ac'. This is typically used in vector notation to denote a vector quantity or direction.
Vector notation for a vector 'v' with a left-pointing harpoon accent.
\overleftharpoon{v}Denotes a vector from point A to point B with a left-pointing harpoon.
\overleftharpoon{AB}Represents a vector in the direction from x to y with a left-pointing harpoon accent.
\overleftharpoon{xy}