Illustrated Socionics function order. Valentine = Fi. Pentagon of Valentines = Fe. Lightbulb = Ni. Question marks = Ne. Gears = Te. Jigsaw puzzle pieces = Ti. Greater than sign in front of eyes = Se (perception). Greater than sign in your head = Si (memory) This gives you a visual description of "what's going on in there?" with different personality types. It's easier to relate to people when you know what their order is.