It is the mint mark signifying that the coin was produced at the Mexico City mint.
Not always
It is a tradition. It was once believed that doing so would mean that baby would have plenty of friends where they grew up.
petit means small or little in French. Sous may mean 'under, underneath' or 'coins, change' in French. The whole is likely to mean 'small change'
A tributary is a small river or stream which flows into a larger river.
If you mean the 1856 Flying Eagle small cent coins? Proof coins were also struck. It's believed that a total of no more than 3,000 coins (including proof's) were produced. Most of the coins were business strikes.
Depends on whether the outlier was too small or too large. If the outlier was too small, the mean without the outlier would be larger. Conversely, if the outlier was too large, the mean without the outlier would be smaller.
the numbers are larger, but could mean less or more: 1/20000000 is small and 20000000/1 is large
What do you mean by "What is the new coins?"
Milligrams are very small, a fluid ounce would be much larger WITCH you mean which
Do you mean the breed of dog originating in Central America?
Coins on clubpenguin are money. You need coins to buy things.
If you mean a "Mintmark"? They are small letters ( O, S, CC & D) on the reverse of the coins.