tiger snap-back (Chinese)

Variations  

The circle point is the distinguishing feature of the tiger shape, with only 1 liberty. Without stones being in proximity, or support, any play at that point may be captured straight-away. That is why tiger shape may exist in such variations.

Black can play at either circle point to kill by snapback.  

As long as the 1 liberty feature exists the shape can be considered a tiger shape. This is because there might be good tactical reasons to play at the circle point.

For example (although unconfirmed) One type of go tactic, the snapback, always involves a play at such a point.