surfboard
Rare term; the common word is サーフボード. This kanji compound literally means 'wave-riding board'.
See also: サーフボード
The word 波乗り板 is hardly used nowadays; サーフボード is the common term.
Compound of 波乗り (なみのり, 'wave riding') + 板 (いた, 'board'). The exact origin is uncertain, but it is a direct calque of English 'surfboard'.