凸 convex, beetle brow, uneven 5 strokes jōyō, taught in secondary school old JLPT 1 #2143 in newspapers Readings Onトツ Kunでこ In Chinese 凸 Words written with it 凸凹 でこぼこ unevenness N2 凹凸 おうとつ unevenness 凸版印刷 とっぱんいんさつ letterpress 凸版 とっぱん letterpress