VO is the ticker for the Vanguard Mid-Cap ETF - https://personal.vanguard.com/us/funds/snapshot?FundId=0939&FundIntExt=INT https://personal.vanguard.com/us/fund

VO is the ticker for the Vanguard Mid-Cap ETF - https://personal.vanguard.com/us/funds/snapshot?FundId=0939&FundIntExt=INT https://personal.vanguard.com/us/funds/snapshot?FundId=0939&... The Sharpe ratio is a measure of the Risk/Return for a given investment - http://www.investopedia.com/terms/s/sharperatio.asp http://www.investopedia.com/terms/s/sharperatio.asp