FII stands for Foreign Institutional Investor, which are entities that invest in the financial markets of a country other than their own. There are several synonyms for FII, including foreign portfolio investors (FPIs), overseas institutional investors (OIIs), and foreign direct investors (FDIs). These terms may be used interchangeably to describe entities that invest in a country's financial markets, such as stocks, bonds, and other securities. While FII is commonly used in India, other countries may have different terms for these investors. Regardless of the term used, these foreign investors play a significant role in contributing to the growth and development of the financial markets they invest in.