Or a "concentration," depending on your level of snootiness.
I always had a sense of superiority that I had chosen my concentration based on an abstract idea of interest and education, completely unmotivated by prospects of future earnings. Sometimes I am haunted that I may have chosen poorly.
This post's theme word: wavenger, "a vagabond; a stray animal." Not a world-wide web avenger, some sort of internet vigilante. But we should make it mean that by using it that way.