35 point low approach two-space low pincer
This is somewhat less severe than the one-space pincer; but also less likely to end up looking like an overplay.
White's other replies that are commonly seen are at a (see 35 Point Low Approach Two Space Low Pincer Side Contact) and b. At c for immediate life is a Kitani joseki.
DaveSigaty: In recent years we can see this pincer used in situations like the following...
Ma Xiaochun (White) - Yi Ch'ang-ho. In this Anti-Chinese fuseki, Black plays 5 to test White's response. When White extends to 6, Black plays the two-space low pincer at 7 backed up by 5. Black continues with 9 on the left so White naturally turns against the lone black stone on the bottom side.
The two-space pincer is not the only choice.