RSU meaning in Stock Exchange ?

Restricted stock, also known as restricted securities, is stock of a company that is not fully transferable (from the stock-issuing company to the person receiving the stock award) until certain conditions (restrictions) have been met. Upon satisfaction of those conditions, the stock is no longer restricted, and becomes transferable to the person holding the award. Restricted stock is often used as a form of employee compensation, in which case it typically becomes transferable ("vests") upon the satisfaction of certain conditions, such as continued employment for a period of time or the achievement of particular product-development milestones, earnings per share goals or other financial targets. Restricted stock is a popular alternative to stock options, particularly for executives, due to favorable accounting rules and income tax treatment.

Restricted stock units (RSUs) have more recently become popular among venture companies as a hybrid of stock options and restricted stock. RSUs involve a promise by the employer to grant restricted stock at a specified point in the future, with the general intention of delaying the recognition of income to the employee while maintaining the advantageous accounting treatment of restricted stock.