The word Ebi means shrimps or prawns. Sometimes Western Riggers uses this as a shortned form of Ebi Shibari, but this would seem nonsensical to a Japanise speaker.
Ebi Shibari 海老縛り
This refers to a tied bent over position which results in a shame that looks a little bit like a prawn. These rope patterns are sometimes called 'forced bows' in the West.
A shibari position which involves arms being in front bent at the elbow sometimes the description 'Zen te hiji shibari' 前手肘縛り is used for this this tie (front elbow binding)