Vertical Ideographic Iteration Mark (U+303B) is a Unicode modifier letter from the CJK Symbols and Punctuation block. It resides on Plane 0 (BMP, Basic Multilingual Plane), has bidirectional class L (left-to-right), is not mirrored, and has combining class 0 (Not Reordered). In HTML it can be written as 〻 or 〻.