Float board

one of the boards fixed radially to the rim of an undershot water wheel or of a steamer's paddle wheel; - a vane.

See also: Float

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Not satisfied with making everyone pay to become board-certified, it was able to float board recertification for many specialties!
"I come home from work, get myself a lemonade, hop onto my little float board and hang out in the pool with the kids for the rest of the afternoon."
He also said sports items such as footballs, swimming equipment, float boards and arm bands would make good presents.