Unicode 9.0 Candidate Emoji
Mark Davis (via Dave Addey):
These emoji have been accepted as candidates for Unicode 9.0 for a variety of reasons. They may be needed for compatibility with emoji characters in existing systems. For example, the FACE WITH COWBOY HAT was accepted for compatibility with the emoji used in Yahoo Messenger. Some are chosen based on expected high frequency of use or because they are highly popular requests from online communities. Others fill gaps in the existing set of Unicode emoji, as by completing a gender pair.
