A coin or paper money note that is very close to being uncirculated. Upon first glance it may appear uncirculated. When inspected closely it will have a slight amount of wear or friction. Same as "About Uncirculated". Sometimes abbreviated as "AU".

Coin that on first glance appears Uncirculated but upon closer inspection has slight friction or rub.AU-50 - AU-55 - AU-58

See About Uncirculated.