In mathematics, LHS is informal shorthand for the left-hand side of an equation. Conversely, RHS is the right-hand side. Each is solely a name for a term as part of an expression; and they are in practice interchangeable, since equality is symmetric. This abbreviation is seldom if ever used in print; it is very informal.
More generally, these terms may apply to an inequation or inequality. In the inequality case, there is no symmetry. The right-hand side is everything on the right side of a test operator in an expression. Conversely, the left hand side is everything on the left side.
During the Cultural Revolution (1966-1976), Red Guards in some cities considered that to drive on the rightside of road was to take the "rightist's route/policy", and they were said to have ordered vehicles to drive on the left side.
Although the British overseas territory of Gibraltar changed to driving on the right on 16 June 1929, in order to avoid accidents involving vehicles from Spain, some public buses until recently were RHD, with a special door allowing passengers to enter on the righthandside.
In Italy the practice of traffic driving on the right first began in the late 1890s, but it was not until the mid 1920s that it became standard throughout the country.
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