Emoji have replaced letters and words for many users specially in messaging and chat apps. Apple's given various emoji more than a fresh coat of paint and added more detail and nuance to various designs. Older emoji weren't designed for viewing on larger displays or on high resolution displays.
Participants of Apple's iOS Public Beta program who install iOS 10.2 on their devices will get the new emoji that conform to the Unicode 9.0 standard. these include about 72 new icons, such as a clown, bacon, a selfie, and a sneezing face. Existing ones have also been redrawn with more detail, and/or different styles. These emoji will be standard once the OS is rolled out as an update to all users.