If your interest is more about "buying low" (and perhaps "Jack" refers to a specific trader or a slang term for "jacking up" profits), you are likely looking at market timing.
Since "Buy Low Jack System" isn't a standard industry term, I've outlined the two most likely things you might be referring to. 1. The LoJack Vehicle Recovery System buy low jack system
If you are looking to protect a vehicle, is a well-known radio-frequency (RF) tracking system. Unlike GPS, which can be blocked by tunnels or shipping containers, LoJack’s RF signal can penetrate concrete walls and basements. If your interest is more about "buying low"