Pilots, Engineers, Physicists

What does magnetic flux, strength reduction factor, and roll angle have in common? Why, the phi symbol, of course! This Greek letter is found in almost every field of science and even some non-science fields. It’s used in philosophy to mean a generic act. Immunologists pair it with an M to mean macrophage. If this letter speaks to you, you’re probably a professional in a field that loves phi and Greek letters! Buy it for yourself or a friend. It makes an excellent gift for biologists, mathematicians, physicists, and organic chemists.