System for a play caller to display calls to participants in an athletic competition

摘要

Disclosed is a system for displaying a play call to participants in an athletic competition, the system having an input device, a display device, a selector, a first block of at least three characters and a second block of at least three characters. The first and second blocks are separated by a division. The first and second blocks each contain one character selected by a play caller and one character selected by the selector.