Vanguard Total World Stock ETF (VT)
Holds every publicly traded stock in the entire world for 0.08% Expense Ratio(ER).
For every $1,000 you have invested it would cost you approximately $0.86 USD/year in expenses. Yes, that's 86 cents per year for every $1,000. or roughly $8 per $10,000 invested per year. Super inexpensive!