CREATE TABLE table_name_16 (antiparticle_symbol VARCHAR(255), rest_mass___mev___c_2__ VARCHAR(255))
What is the antiparticle symbol with a rest mess (mev/c2) of .47 ± .33?
    
SQL: SELECT antiparticle_symbol FROM table_name_16 WHERE rest_mass___mev___c_2__ = ".47 ± .33"