光棍節

Etymology
From being a day for single people who are not in a relationship. From slang for a bachelor without familial branches being a bare stick, and the set of ones in the date of 11/11 being a set of sticks, a set of singles. Originating at the University of Nanjing in the 1990s as Bachelors' Day, and popularized as a shopping event day by Alibaba in the 2000s.

Proper noun

 * 1) Singles' Day, celebrated annually on the 11th of November