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A jump raise is a raise of 2 levels (therefore also called double raise). Here's an example:

Opener Responder
1 3

It originally showed a forcing raise in the majors and strongly invitational in the minors, but later it changed to show an invitational hand (limit raise). With Bergen raises, a jump raise shows an exceptional weak hand with a 9-card fit. This usage is alertable.

Raises

Single raise - Jump raise
Competitive raise - Preemptive raise - Constructive raise - Limit raise - Forcing raise
Inverted minor raise - Bergen raise - Splinter - Jacoby 2NT - Truscott 2NT (Jordan 2NT)
Quantitative slam invite