The term "lobster" is used to refer either to a particular polyiamond or to a class of tree called a lobster graph.
When referring to polyiamonds, the lobster is the 6-polyiamond illustrated above.
Lobster
See also
Lobster Graph, PolyiamondExplore with Wolfram|Alpha
References
Chen, W.-C.; Lu, H.-I; and Yeh, Y.-N. "Operations of Interlaced Trees and Graceful Trees." Southeast Asian Bull. Math. 21, 337-348, 1997.Golomb, S. W. Polyominoes: Puzzles, Patterns, Problems, and Packings, 2nd ed. Princeton, NJ: Princeton University Press, p. 92, 1994.Koh, K. M.; Rogers, D. G.; and Yap, K. Y. "Graceful Graphs: Some Further Results and Problems." Congr. Numer. 29, 559-571, 1980.Referenced on Wolfram|Alpha
LobsterCite this as:
Weisstein, Eric W. "Lobster." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Lobster.html