Hane at the head of three stones
Apart from Hane at the Head of Two Stones, one also often hears "hane at the head of three" - and rightly so. In fact, although the value of the hane decreases when the line gets longer (with two or three stones, it is quite menacing for the opponent's stones, especially when combined with the 'foot hane?', when there are more stones they can more easily manage themselves), playing hane at the head of a line is a key point for influence for any length of line.
-- Andre Engels