Let be a complete normal Variety, and write for the group of divisors, for the group of divisors numerically equal to 0, and the group of divisors algebraically equal to 0. Then the finitely generated Quotient Group is called the Néron-Severi group.
References
Iyanaga, S. and Kawada, Y. (Eds.). Encyclopedic Dictionary of Mathematics. Cambridge, MA: MIT Press, p. 75, 1980.