Roman 2D bids are available in 12-15 and 17-20 ranges. They show 3-suited hands (4/4/4/1 or 5/4/4) with unspecified shortness. To find the shortness, responder bids 2NT, and opener bids the short suit.
S: KJxx
H: Q
D: AQxx
C: xxxx
S: AQxx
H: KJxx
D: Kxxx
C: x
W N E S
2D
P 2N P 3C
P 4S P/O
Notes: 3C = club shortness.