When applied to a system possessing a length 
at which solutions in a variable 
change character (such as the gravitational field of a sphere
as 
runs from the interior to the exterior), the symbols
 |
 |
are sometimes used.
Greater than/Less than Symbol
See also
Equal, Greater, LessExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Greater than/Less than Symbol." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/GreaterthanLessthanSymbol.html