The 3/8" wide ring that surrounds the perimeter of the scoring area is the doubles area. Also, the inner bull is the double bull (although they just call it the bull in Europe). The 3/8" wide ring that is midway between the bull and the doubles ring is the triples ring (they call them trebles across the pond).
Impossible as maximum score with 2 darts is 120! T17-D20 and T19-D17
You can score 180 on darts
Darts
60, the highest single-dart score on the board
12
The least number of darts needed to score 501 points in a standard game of darts is 9 darts. This can be achieved by scoring three triple 20s (60 points each for a total of 180 points) and then finishing with three more darts that score 180 points combined, such as two triple 20s and a double 20.
180 is the highest score in darts. Three triple 20s is worth 180 points.
A shanghai is a single, a double, and a triple of the same number in one throw of three darts.
The smallest number that you can't score with 3 darts, not including 1, is 4. With 3 darts, you can score any number from 3 (by hitting a score of 1 with each dart) up to 60 (hitting three triple 20s), but you cannot reach the score of 4 using the available scores on a dartboard.
507
420
Darts.