What does JACK stand for?

Golden Bear Golf, Inc. - NASDAQ symbol (SAG)

Jackpot Enterprises Inc. (SAUO)

Jack's Trailer Manufacturing - NCIC trailer make code

Junior American Coin Klub (EA)

Junior Assistant Cook - British military (DMA)

Steve Jackovich - Air show performer (ASPC)

Jack - Botanist in plant scientific name (HUH)