>= function compares numbers according to "greater than or equal" predicate. Each (overlapping) pair of the numbers is compared by it. The result is true if all compared pairs satisfy comparison. Note that complex numbers cannot be compared.

(>= 2 1) => T
(>= 1 2) => NIL
(>= 2.001 2) => T
(>= 2 2) => T

(>= 9876543210987654321 1234567890123456789) => T
(>= 5 4 3 2 1) => T
(>= 5 3 4 2 1) => NIL
(>= 5 4 4 2 1) => T
(>= 7/9 3/4) => T
(>= 5) => T