Unicorn courtesy of balpha on meta.stackoverflow.com.
Q&A for computer enthusiasts and power users
Q&A for professional and enthusiast programmers
Q&A for people studying math at any level and professionals in related fields
Q&A for scientists using computers to solve scientific problems
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Q&A for active researchers, academics and students of physics
Q&A for professional mathematicians
Q&A for professional programmers interested in conceptual questions about software development