The front of the coin is called the obverse, the back of the coin is called the reverse.
- More -
It's not always possible to know what characterizes "front" or "back", though. In most cases the obverse of a coin carries a portrait or similar image, while the reverse has the denomination and possibly a less-specific picture. However common usage can sometimes trump those rules. For example, most coins of the British Commonwealth carry the monarch's picture on one side and a denomination-specific design on the other. So by definition the side with the monarch is the obverse, but in practice most people treat the opposite side as the coin's front! European Coins have a shared design on one side and a country-specific design on the other; the EU avoids the whole obverse/reverse issue by referring to the coins' "common side" and "national side".
It means the front side the "heads" of the coin. The reverse is the opposite end often called the "tails" of a coin.
Lots of wear on the coin and the lowest grading possible.
edge of a coin with grooved lines that run around the entire perimeter of the coin
In coin collecting, it means Brilliant Uncirculated, a very nice coin, but not as good as a Proof coin.
A coin described as "Premium Quality" is an above average example.
A coin collection is called, well, a coin collection. The hobby of collecting coins is called numismatics.
a coin collector
It means "premium quality". It is not an official form of grading.
Coin collecting
A coin which has "circulated" shows evidence of use in commerce, such as luster interruption, wear, circulation marks, dirt, etc. Conversely, an "uncirculated" coin displays no such evidence.
If you mean a mint mark on the reverse of the coin, it's a D or S but not a P. Please look at the coin again.
While the president has not said much about coin collecting, he has said a lot about education and about the importance of hobbies that are educational. Both stamp collecting and coin collecting teach about geography and about important historical figures, so the chances are, he would be in favor of such hobbies.