Being bound by rope.
To be punished by being tied in the ebi (“shrimp” or “prawn”) tie was a form of torture that was mandated by the Tokugawa shogunate in 1742 as one of 7 official punishments for criminals and enemies of the state.
Therefore, be advised, in the short term the ebi shibari is a fun position for SM play but can be quite an ordeal over time. Please play carefully.
See also: Ebi shibari.