user: ### NOW ANSWER:
Question: What is the antiparticle symbol with a rest mess (mev/c2) of .47 ± .33?
Columns: ['Particle name', 'Particle symbol', 'Antiparticle symbol', 'Quark content', 'Rest mass ( MeV / c 2 )', 'J P C', 'Mean lifetime ( s )', 'Commonly decays to (>5% of decays)']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['D meson', 'D +', 'D −', 'c d', '1,869.62±0.20', '0 −', '1.040 ± 0.007 × 10 −12', 'See D + decay modes']
SQL:

assistant: SELECT "Antiparticle symbol" FROM "Table" WHERE "Rest mass ( MeV / c 2 )" = '.47 ± .33';