1, The full form of MISA is Maintenance of Internal Security Act. It’s used on Governmental ,Law & Legal in India

Maintenance of Internal Security Act (MISA) was a law passed by the Indian parliament in 1973 giving the administration of Prime Minister Indira Gandhi and Indian law enforcement agencies super powers – indefinite “preventive” detention of individuals, search and seizure of property without warrants, and wiretapping – in the quelling of civil and political disorder in India, as well as countering foreign-inspired sabotage, terrorism, subterfuge and threats to national security.

2, The full form of MISA is Media Institute of Southern Africa. It’s used on Associations & Organizations ,Non-Profit Organizations in South Africa

Media Institute of Southern Africa (MISA) is a non-governmental organisation that focuses primarily on the need to promote free, independent and pluralistic media.