This is a computer sign that
stands for not the same as or separate from in expressions like A><B. The ideogram indicates that A goes in one direction,
and B in another, . and mean approximately the same thing in mathematics: less
than or greater than.
In the ground-to-air emergency code signifies that the airplane is badly damaged.
The identical structure, , is a Spanish hobo sign indicating that here there are friends.
Compare with , a variation of the signs for universal brotherhood for the Hopi people in Arizona.