3-4 point low approach two-space high pincer diagonal kado
Here , a kado play, leads to some difficult variations, if White doesn't want to submit and allow Black outside influence.
This joseki isn't really current in pro play now: but this main line has been worked out. at is an important variation, as is at (leading to a peaceful result, but no longer adopted by pros, it seems). Here the good empty triangle holds Black together, and the serious fighting starts.
After and , White at a is the old main line; pro games played before this joseki was apparently discarded a decade ago had White at b and c. Obviously the cutting stone is a key stone here: much analysis based on White escaping past or netting the marked stones can be found in books.