U+FE5F "﹟" Small Number Sign Unicode Character

U+FE5F "﹟" Small Number Sign is a small variant of the standard number sign or hash symbol, often used in typography and formatting contexts where a more compact or vertically compressed version of the character is desired, particularly in vertical text or narrow CJK (Chinese, Japanese, and Korean) font layouts. It belongs to the Compatibility Forms block, which includes small forms of punctuation and symbols designed to match the proportions of East Asian ideographs, and it is typically employed in technical notation, such as indicating numbers in titles or listings, or as a prefix for ordinal labels.