INT2 is a synonym for SMALLINT.

CREATE TABLE t1 (x INT2);

DESC t1;
+-------+-------------+------+-----+---------+-------+
| Field | Type        | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| x     | smallint(6) | YES  |     | NULL    |       |
+-------+-------------+------+-----+---------+-------+