How many players are at the DT position? 
CREATE TABLE table_21321804_3 (player VARCHAR, position VARCHAR)
SELECT COUNT(player) FROM table_21321804_3 WHERE position = "DT"
### Context: CREATE TABLE table_21321804_3 (player VARCHAR, position VARCHAR) ### Question: How many players are at the DT position?  ### Answer: SELECT COUNT(player) FROM table_21321804_3 WHERE position = "DT"