This is the badge for the serving style of nitro. Have 5 beers served this way to get the badge. It levels upto 100.

Beers carbonated by a mix containing nitrogen gas instead of the more common CO2 have a smoother, silkier head. It is most commonly associated with stouts, and especially Guinness.

In theory any style can be served on Nitro, however it tends to fade hoppy aromas which doesn’t exactly make it ideal for your average IPA.