Definition:Below


 * Numbers:
 * Number $a$ is below number $b$ $a$ is less than $b$.


 * Solid Geometry:
 * Point $a$ is below point $b$ the height of $a$  a given frame of reference $R$ is less than the height of $b$  $R$.


 * Plane Geometry:
 * Point $a$ is below Point $b$ the $y$ coordinate of $a$ is less than the $y$ coordinate of $b$.

Also see

 * Definition:Above