Yeah, that's for the expansion processor in it, games with extra hardware like Mega Man X2+ have those tabs for their coprocessors power and such. And I also think for some reason this game also had a revision where it didn't have an expansion processor? Could anyone refresh my memory on that?
But games that have 3 connectors are stuff like Pilot Wings,, F1 Race Of Champions 2, Starfox, Yoshi's Island, Kirby Super Star, Kirby Dreamland 3, and more.
This was originally what you saw on the Super FX chip games like StarFox & Stunt Race FX, but Mario RPG used an updated version called the Super FX2 chip.
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I expected you to ask about the single metal pin embedded to one side of the slot. I had the answer ready since I asked it myself earlier this year.