What is the name of the footing why and where it is used?

Interesting configuration - I can't say I've ever seen a column footing configured like this. I think Mehboob has touched upon how/why/where these might be useful - Situations where spread footings are desired (no deep foundations, like piles or caissons...), columns are needed, and the bearing capacity of the in-situ soil is high enough to carry the load. Very interesting....