Here we have the arrow sign, one of the oldest and most common
of ideograms. Both and have been discovered in prehistoric caves
and engraved on rocks in the Sahara. An arrow sign indicates
movement in a specific direction. It is used with this meaning
by the boy-scouts, as a traffic sign, etc. In some modern sign
systems it is placed between other signs and implies that the
sign to the right of an arrow pointing to the right is the
result of, or follows logically from what is denoted by the sign
to the left of the arrow: (a b). The arrow is also an ideogram
representing the male sex. Compare with , a sort of inversion of
, for the receiving end, the female sex. Occasionally has a
phallic symbolism, as in . In modern ideography the arrow sign
is also associated with snow and frost. See, for example, ,
frosty mist, a combination of the sign , mist, and . In the
computer world can mean exponentialization (also drawn ), i.e. a
multiplication of the sum by itself. In physics is sometimes
used to denote a center of