Dictionary of Ichthyology  

The hook's pattern is usually based on the shape of the bend and named types include Carlisle, O'Shaughnessy, Eagle Claw, Beak, Kirby, Model Perfect, Aberdeen, Siwash, Limerick, Sproat, Sea Mate and Albacore.

Limerick hooks from the U.S. Fish and Wildlife Service. Photograph by Brian W. Coad.

Canadian Museum of Nature