㏬

Etymology
This telegraph symbol ㏬ became part of Unicode due to its inclusion in Row 15 of GB 8565.2-88 表 A4 (1988), from 9913 of 标准电码本（修订本） (1983). First appears in 1933. See also Appendix:Chinese telegraph code/Mainland 1983 and.

Symbol

 * 1)  the thirteenth day of the month