S-Line - Ample breasts and buttocks when viewed from the side

S-Line (second use) - Side view: forehead to bridge of nose to tip of nose

V-Line - A slim and oval face narrowing towards the chin

V-Line (second use) - The line in-between the breasts

W-Line - Breasts viewed from the front

X-Line - Long legs and arms connected by a narrow waist

U-Line - Exposed lower back in low cut clothing

M-Line - A "six pack" of abdominal muscles on men

D-Line - A pregnant (or pregnant-appearing) abdomen

B-Line - Big breasts, big abdomen

O-Line - Generalized obesity

Apparently there are other lines as well but it seemed a bit complicated =_= But here's the SOURCE if you want to read a bit more. 

It feels like they missed the F-line, the fat line XD Or we can name the W-line into Whale line instead ;''''D XD hahaha *lousy humour*