JACOBY 2NT ("Original")
Most tournament players use "JACOBY 2NT" in conjunction with their 5-card major system. After an opening of 1-MAJ, a jump to 2NT is conventional. It promises a GF hand and at least 4-card support.
This convention should not be used by a passed hand and should not
...
J 
J98543 
K8 
AQ102