What is a JRT Shorty? Questions

I know the answer to the above question is probably simple, but what does it mean? Thanks!

A short legged Jack Russell Terrier, as opposed to the squarer built type, such as the Parson Jack Russell Terrier.
From April this year, the shorter legged type will also become eligible for UK KC registration, - subject to some conditions. They have, however, had FCI recognition for quite some time.

Thanks for the info!

Shorties can sometimes be known as puddin dogs, this is when their front legs are bow shape