ㄲ
쌍기역 (ssanggiyeok)
A tight k with no puff of air, like the k in “sky.” Tense your throat a little.
StrokesTwo strokes: write a narrow ㄱ on the left, then a second ㄱ beside it.
Easy to confuseㄱ — ㄲ (doubled) is tense; ㄱ is soft. 굴 is an oyster, 꿀 is honey.
Examples
꽃
kkot
flower
토끼
tokki
rabbit
까치
kkachi
magpie