I search smilies / emoticons for my Android App. I found that there are some open source sets available like used by pidgin.
But I was wondering about the emoticons used in Whatsapp. They are basically very nice. Thus I thought that they are licensed by whatsapp. Now I have installed the messanger "telegram" and I was suprised. They are using the same emoticons than in whatsapp. How can this work out? Are the emoticons publicly available?
Both Whatsapp and Telegram (and a lot of other messenger apps, browsers and operating systems) use the Emoji sets.
The different types of Emoji are a result of different fonts for emoticons; they have a different appearance depending on the "font" used but the base is always a unicode set of characters.
Both Whatsapp and Telegram use the Apple implementation apparently, as Ivo's link specifies. Also see this github for more licensing info.