Hiraki
Hiraki (ヒ ラ キ) means extension , usually from a single stone but possibly from a wall.
DieterVerhofstadt: Can someone add niken hiraki and sangen hiraki ?
SAS: Shouldn't these be niken-biraki and sangen-biraki? (And what's wrong with two-space extension and three-space extension?)
KarlKnechtel: I suppose hiraki is a general term, as opposed to, say, tobi (a straight-line extension)?
Charles Matthews: Tobi is for a jump in the centre, hiraki an extension along a side.