Table schema:
CREATE TABLE table_name_16 (antiparticle_symbol VARCHAR, rest_mass___mev___c_2__ VARCHAR)

Question: 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"