Restricted Stock Unit; a form of compensation that a company may provide.

Such stock is subject to a vesting period, where you only gain the stock after a period of time.

I'm aware but I don't think unvested RSUs are subject to divorce asset splitting. Unvested RSU is like unearned salary. It's not an asset to split.

Maybe you mean vested but not released RSUs in pre-IPO companies.

You give family court too much credit.