What does au- sb mean in coins description?

In coin descriptions, "AU" stands for "About Uncirculated," indicating that the coin has minor wear but retains much of its original luster and details. The "SB" typically refers to "Silver Bullion," indicating that the coin is made of silver and is valued primarily for its metal content rather than its numismatic value. Together, "AU-SB" suggests a silver coin that is in about uncirculated condition.