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Unit of length
Many different
units of
length
, width,
height
, depth, and
distance
have been used around the world. The main units in modern use are
U.S. customary units
in the
United States
and the
metric system
elsewhere. British
Imperial units
are still used for some purposes in the
United Kingdom
and some other countries. The metric system is sub-divided into
SI
and non-SI units.
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