AU means almost uncirculated which is a grade for the coin, depending on the grade on the coin and the year of it, the value of the coin can be from $25 for the most common and lowest grade dollars all the way to $575,000 for the second highest grade, most rare silver dollar(1893S)(no proof 70 silver dollar has ever been found)
Try again; there weren't any Morgan dollars minted that year.
There were two different silver dollar types issued in 1921, as they phased the Morgan Dollars out, and introduced the "new" Peace Silver Dollar. If it's a Morgan, this is the most common date in the series, and an AU would retail for about $30. If it's a Peace Dollar, the retail price would be closer to $120.
AU stands for "About Uncirculated" and is not a code it's a grade. If you mean a mintmark? If the coin has one it's on the reverse above the letters DO in DOLLAR.
1883 Morgan dollars are very common. Coins in the AU (about uncirculated) grade range have values of $22.00-$26.00
The 1900 Morgan dollars issued from the New Orleans Mint are known to have medium size mintmarks. This is not a recognized variety. The 1900-O Morgan is considered common. AU grade coins currently have values of $35.00-$40.00.
Australian dollars
argent (AU) is the latin word for silver.
In the periodic table AU stands for Gold, otherwise known as Aurum.
gold and silver fools
No, "Au" is not the symbol for silver. It instead is the symbol for gold whereas "Ag" is that for silver.
The 1921-S Morgan is very common in all grades, if slightly circulated is a grade of AU-55 or AU-58 retail prices are $20.00 and $23.00
Gold: Au Silver: Ag Platinum: Pt