U+303B "〻" Vertical Ideographic Iteration Mark Unicode Character

U+303B "〻" Vertical Ideographic Iteration Mark is a typographic symbol used in traditional East Asian writing, particularly in Japanese and Chinese texts, to indicate the repetition of a preceding character or group of characters when written in vertical script, functioning similarly to the horizontal iteration mark (々) but designed specifically for vertical text layouts. Its appearance as a pair of short, slanting strokes is a visual cue for the reader to repeat the ideograph or phrase directly above it, streamlining the text by avoiding full character duplication. While less common in modern digital usage due to the prevalence of horizontal writing, it remains a notable feature in historical documents, calligraphy, and certain formal or stylized vertical inscriptions.