This pill is white, round and 5/16 inch (8 mm) in diameter. It has the same exact imprint on each side, a plain capital "A" followed by a lower case "b" inside of a box. The box is the same height as the capital "A" so the "b" is smaller than the "A". I live in the USA so this may be a pill from the US. There are no numbers or other letters on the pill.