A pixel sig is the carntoon 1's that are made 1 pixel at a time, basically the smallest tool used to make them.... Abstract's are the signatures that aren't really anything usually... They look cool... As in abstract (not there) or concrete (something real) Most people have an abstract sig... Ill get you 1 to show you lol... Abstract: All kind's of different styles.... Terragens are signatures that are land... Like a waterfall or a mountain, water a cliff ect......... well sorry... he didnt brush the whole sig, but the designs are brushed...