No, I meant unearned income. "Earned income" is income from a W-2 or 1099-Misc or something similar. "Unearned income" is dividends, interest, distributions from a trust or partnership, etc.
Basically it's income you don't work for and it's taxed less than income from your job. You don't pay FICA taxes on it (and conversely you don't get credit for social security in the future). This is part of the reason why wealthy people pay lower % taxes than people who work. And it should be addressed.