U+33F1 "㏱" Ideographic Telegraph Symbol for Day Eighteen Unicode Character

U+33F1 "㏱" Ideographic Telegraph Symbol for Day Eighteen is part of a block of characters known as CJK Compatibility, which was originally included to represent dates and times used in Japanese telegraph codes. This specific symbol encodes the number 18 as it would appear in a telegraph message, combining the Chinese characters for "ten" and "eight" into a single unit. It was adopted into Unicode for the purpose of preserving compatibility with older data and systems that utilized this specific notation.