3 types of Tsuki (突き) derives from the verb tsuku (突く), meaning "to thrust".

I made a quick video with my wife behind the camera.
There was a great question within a Bujinkan forum about 3 types of tsuki(Thrust) that were taught in regard to Kukishin Ryu Sojutsu. These were the ones taught to us by Someya Sensei during our 2015 Japan trip. Another not shown was with Yoko aruki also.