hane at the head of two stones
A Go proverb advising that when you have two stones in a row, you should play a hane (a diagonal move wrapping around the opponent's stone) at the head of those two stones without hesitation. This is a fundamental shape and strategic concept in Go.
"Nimoku no atama wa mizu hane yo" is one of the famous proverbs of Go.
ハネ is the specific move of playing diagonally around an opponent's stone; this proverb uses ハネ as the recommended action.
二目 refers to two stones in a row; the proverb specifically addresses the shape of two stones.
A traditional Go proverb. The exact origin is uncertain, but it has been passed down as a fundamental strategic principle in Go.