SELECT "Articulatory class" FROM table_9323 WHERE "Non- stop" = '(ㆁ)'
If the Non- stop is ( ), what is the Articulatory Class?
CREATE TABLE table_9323 (
    "Articulatory class" text,
    "Non- stop" text,
    "Plain stop" text,
    "Aspirated stop" text,
    "\"Muddy\" voice" text
)