CREATE TABLE table_57790 ("Phoneme" TEXT, "Realization" TEXT, "Environment" TEXT, "Example" TEXT, "Gloss" TEXT)

Name the phoneme when the realizationis [ ]
SELECT "Phoneme" FROM table_57790 WHERE "Realization" = '[ɑ]'
SELECT "Phoneme" FROM "table_57790" WHERE "Realization" = '[ɑ]'