The Unicode consortium reserved a place under the sign of Facepalm, which is used to express a sense of shame for another person. The sign will look like this:

In 2011, when Unicode began to support Emoji, an employee of the Medusa cards (and then Lentapedia) Denis Dmitriev jokingly suggested adding this sign to the standard. Then the matter did not go beyond the discussion.
The Unicode 9.0 version with Facepalm will be released in mid -2016. Not only facepalm and other signs will be added there. For example, owl:

In June 2015, Unicode 8 will be released. There will be no Facepalm.