Link Crossing Number
The least number of crossings that occur in any projection of a link. In general, it is difficult to find the crossing number of a given link. Knots and links are generally tabulated based on their crossing numbers.
SEE ALSO: Knot, Link
REFERENCES:
Referenced on Wolfram|Alpha: Link Crossing Number
CITE THIS AS:
Adams, C. C. The Knot Book: An Elementary Introduction to the Mathematical Theory of Knots. New York: W. H. Freeman, pp. 67-69, 1994.
Hoste, J.; Thistlethwaite, M.; and Weeks, J. "The First 
Knots."
Math. Intell. 20, 33-48, Fall 1998.
Weisstein, Eric W. "Link Crossing Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/LinkCrossingNumber.html
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2,5 torus knot
