A - Four page folder

B - A four page folder with short fold

C - A six page fold 

D - A six page concertina fold

E - A eight page barrel fold

F - An eight page concertina fold

G - An eight page fold, called a French fold 
when printing is on one side ony

H - An eight page fold, with two 
parallel folds

I - An eight page fold

J - A ten page concertina fold with four short 
sides - a folding nightmare for 
most binderies