||last updated: 2005-11-05
Crosses are regular, pointed figures, commonly formed by (often
perpendicular) skew lines. They are often used as symbols and signs.
A curve composed of equal line pieces through the origin is called a line
The figure can be oblique (as the character x or the multiplying sign x) or
perpendicular (as the summation sign +).
In the Netherlands a number of public health organizations have a cross in their
the Red Cross, the Green Cross and the Ivory Cross (and the former
Orange-Green Cross and White-Yellow Cross).
The cross is used as
military decoration, and it has religious meaning as the crucifixion of Jesus
the cross is used as symbol for the death.
right-handed swastika is on old symbol used in various cultures
to denote prosperity and good fortune 1).
Adolf Hitler adopted the left-handed swastika for his National Socialism.
There is also a quartic swastika curve.
Double skew lines are used in music notation as the sharp: #.
The 'cross of Einstein' is a fourfold image of an celestial object, where gravitational
fields act as a lens.
1) The word swastika has been derived from the Sanscrit.