Q: Nidhi.

Ans: NIDHI: National Initiative for Development and Harnessing Innovations (NIDHI).

NIDHI is a company. 

Traditionally means treasure.

Cultivating the habit of thrift. 

Lending money for mutual benefit. 

Nidhi : registered under Company act and controlled by RBI.

Companies act, 2013: Section 406 and companies act,  1956, Section 620.