The phrase "D.G. Regina" on the Canadian $2 dollar coin; what does it mean?

I live in Detroit, USA (right on the border from Windsor, ON, Canada) and I make frequent trips across the Detroit River to Canada usually exchanging US currency for Canadian currency. I always see the phrase "D.G. Regina" on the "tooney" and I am curious to find out what it actually means. Please help me my fellow northern neighbors- OOPPS!! I mean "neighbours" !

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