<   ( n1 n2 - flag )    True if n1 less than n2. "less-than"
=   ( n1 n2 - flag )    True if top two numbers are equal. "equals"
>   ( n1 n2 - flag )    True if n1 greter than n2. "greater-than"
0<  ( n - flag )    True if top number negitive. "zero-less"
0=  ( n - flag )    True if top number zero. (equivalent to NOT) "zero-equals"
0>  ( n - flag )    True if top number greater than zero. "zero-greater"
D<  ( d1 d2 - flag )    True if d1 less than d2. "d-less-than"
U<  ( un1 un2 - flag )  Compare top two items as unsigned integers. "u-less-than"
NOT ( flag - flag ) Reverse truth value. (Equivalent to 0=)


