A wave that is slightly bigger than the height of a surfer. Double-overhead is twice the surfer's size, and so forth. This method of assessing wave height, while imprecise—overhead to a 12-year-old grommet might not be overhead to Maverick's surfer and one-time Trinity College power forward Grant Washburn—was developed to lend some measure of consistency to an area of the sport where numbers have become almost meaningless. A 10-foot wave in California, for example, might be called six-foot in...