What does Arena stand for?

Arena Magazine - A publication (BRI)

Adoption Resource Exchange of North America - Later, NAIES (EA)

Alianca Renovadora Nacional - Alliance for National Renewal - Brazil - Political party (PPW)

Alianza Republicana Nacionalista - Nationalist Republican Alliance - El Salvador - Political party (PPW)

Applied Research Ethics National Association (EA)

Archaeological Records of Europe Network Access - Project - European Commission (AHDS)

Nationalist Republican Alliance (El Salvador) - Political party (PSAP)

National Renovating Alliance (Brazil) - Political party (PSAP)