What is the Main use of emley moor tower (mk.3)?
CREATE TABLE table_6446 (
    "Name" text,
    "Pinnacle height" text,
    "Structural type" text,
    "Main use" text,
    "Country" text,
    "Town" text
)
SELECT "Main use" FROM table_6446 WHERE "Name" = 'emley moor tower (mk.3)'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the Main use of emley moor tower (mk.3)? ### Input: CREATE TABLE table_6446 (
    "Name" text,
    "Pinnacle height" text,
    "Structural type" text,
    "Main use" text,
    "Country" text,
    "Town" text
) ### Response: SELECT "Main use" FROM table_6446 WHERE "Name" = 'emley moor tower (mk.3)'