Google has removed emoji support from search results for the desktop and mobile.
According to thenextweb.com, pages that use emoji will not be penalized, Google just will not show the symbols when it shows the page in search results. Emoji will still be used as headers in search when accompanied by text.
Emoji has been in use on mobile search for some time now and on the desktop for a few months ago.
Emoji is being used by some brands in an attempt to find a new way to the top of search results.
Also, other apps, like Yelp, still allow for emoji to be used in search.