The DONT convention " Disturb the Opponents' Notrump " is use with 14 HCPs for the opening 1 NT of by opponent.

x : one suiter; relays responder to 2C.

2C : Two suiter (usually at least 5-4)
2D : Two suiter (usually at least 5-4)
2H : Two suiter (usually at least 5-4)
2S : Spade one-suiter.

2NT : Major-minor two-suiter (6-5 or better). Relays partner to 3C

3C : Preemptive, Long suit ( 7+ cards ).
3D : Preemptive, Long suit ( 7+ cards ).
3H : Preemptive, Long suit ( 7+ cards ).
3S : Preemptive, Long suit ( 7+ cards ).

3NT : Major two-suiter (6-5 or better), monster hand.