Until yesterday my display name was 2 characters. This ended when I started wondering about some issues with comments and notifications, went to meta, and found out that
there is an important featureimportant feature which only works if the display name is at least three character long.
Methinks, I should not have discovered this accidentally. I should have been warned, maybe even prevented from creating a display name that turns off some of the site's features. Kindly consider implementing this.