What Does DG Regina Mean on Canadian Coins?

By GovMint :

On some Canadian coins, the inscription "D.G. Regina" stands for "Dei Gratia Regina," which translates to "By the Grace of God, Queen" in Latin. This phrase had been a traditional part of Canadian coinage throughout the lifetime of Queen Elizabeth II, indicating the monarch's divine right to rule and emphasizing the royal authority behind the currency.  The inclusion of "D.G. Regina" on historical Canadian coins reflects the country's historical ties to the British monarchy and the role of the reigning monarch as the head of state.

Sources Used:

https://www.mint.ca/en-us/discover/faces-of-the-monarch