消波ブロック

Compound of 消波(しょうは) (shōha, “wave-cancelling”) + ブロック (burokku, “block”).[1][2]

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消(しょう)波(は)ブロック • (shōha burokku) 

1. a tetrapod (a concrete structure used in breakwaters to absorb and reduce the energy of waves, such as along a shoreline)

   Synonym: (brand name) テトラポッド (tetorapoddo)

While this kind of breakwater component structure is most commonly a tetrapod with four feet, the term 消波ブロック (shōha burokku) can refer to any blocky piece used in a breakwater, such as designs with six feet or even eight.[1]