Fullwidth Digit Zero (U+FF10) is a Unicode decimal digit from the Halfwidth and Fullwidth Forms block. It resides on Plane 0 (BMP, Basic Multilingual Plane), has bidirectional class EN (left-to-right (European number)), is not mirrored, and has combining class 0 (Not Reordered). In HTML it can be written as 0 or 0.