The invariant nu is a Heegaard Floer theoretic invariant defined by Ozsvath-Szabo . It is closely related to nu^+ and nu^-. It is a concordance invariant which takes integer values. Values of nu in the database were computed using a program written by Zoltan Szabo, available at: .
 Ozsvath, P. and Szabo, Z. Knot Floer homology and rational surgeries, Algebraic & Geometric Topology. 11 (2011), no. 1, 1-68. Arxiv.
 Hom, J. A survey on Heegaard Floer homology and concordance, Journal of Knot Theory and Its Ramifications. Vol. 26, No. 02, 1740015 (2017). Arxiv
 Szabo, Z. Knot Floer Homology Calculator Knot Floer Homology Calculator