In Chinese, this symbol is pronounced "zhi" and in Japanese "yubi". Stands for a finger or a toe, which is pointing at a certain place or in a direction.
The Japanese 'Reserved' button emoji was introduced in 2009 and released as part of the Unicode 11.0 standard. This emoji can be found under the symbols
category. Because the Japanese 'Reserved' button emoji has been around for quite some time, it should display correctly in the majority of operating systems.