It’s 😂, the “Face with Tears of Joy” emoji.
This year Oxford University Press have partnered with leading mobile technology business SwiftKey to explore frequency and usage statistics for some of the most popular emoji across the world, and 😂 was chosen because it was the most used emoji globally in 2015. SwiftKey identified that 😂 made up 20% of all the emojis used in the UK in 2015, and 17% of those in the US: a sharp rise from 4% and 9% respectively in 2014. The word emoji has seen a similar surge: although it has been found in English since 1997, usage more than tripled in 2015 over the previous year according to data from the Oxford Dictionaries Corpus.
I know the choice has received its fair share of flak on account of it not being a word but a pictograph, but I like it. Languages evolve naturally and it’s refreshing to see this acknowledged.