What does ENSA stand for?

Empresa Naviera - Common carrier symbol

Enterprise Network Storage Architecture (VLIE)

Entertainments National Service Association - Facetiously translated as "Every Night Something Awful" - Military - British

Environmental Services of America, Inc. - NASDAQ symbol (SAG)

Equipos Nucleares, SA (EFIS)

European Neutron Scattering Association - United Kingdom (EAIO)