凸凸

Traditional form:

凸凸

Pinyin (reading):

tūtū

Definitions:

• convex on both sides (of lens)
• biconvex

Characters:

• 凸 - to protrude, to bulge out; convex
• 凸 - to protrude, to bulge out; convex

Traditional characters:

• 凸 - to protrude, to bulge out; convex
• 凸 - to protrude, to bulge out; convex