Silver BU
“Silver BU” refers to silver coins that are in Brilliant Uncirculated (BU) condition. The term “BU” stands for “brilliant uncirculated”, which means the coin has never been in circulation and retains almost all of its original mint luster from its initial strike.
Brilliant uncirculated (BU) coins are typically stored after minting and have not been heavily handled. Coin collectors and coin dealers often abbreviate the ‘brilliant uncirculated’ term, referring to them as BU coins.