When two straight lines are combined to form a right angle, as in
, and appears in an astrological context, it
strangely enough signifies half a right angle i.e. a 45 degree
angle. This is
because in astrology is used to denote an angle of
90 degrees, and because is half of .
The astrological sign has its origins in Greece and is at least 2,000 years old. In ancient Greece this sign was used to denote half of something.
This sign is also used in the ground-to-air emergency code and means need fuel and oil.