A restricted stock award is when a company grants someone stock as a form of compensation. The stock awarded has additional conditions on it, including a vesting schedule, so is called restricted stock. Restricted stock awards may also be called simply stock awards or stock grants.
technical What restricted means here is actually complex. It refers to the fact that the stock (i) has certain restrictions on it (like transfer restrictions) required for private company stock, and (ii) will be subject to repurchase at cost pursuant to a vesting schedule. The repurchase right lapses over the service-based vesting period, which is what is meant in this case by the stock “vesting.”
Typically, stock awards are limited to executives or very early hires, since once the value of the shares increases, the tax burden of receiving them (without paying the company for their value) can be too great for most people. Usually, instead of restricted stock, an employee will get stock options.