Y: Y is a letter appearing in a stock symbol that specifies that a given share is an American Depositary Receipt (ADR).

Yield: the measurement of an asset's performance.

Year to date (YTD): refers to the period of time from the first day of the current calendar or fiscal year to the current date. This information is useful for analyzing company trends over time or for comparing performance data with competitors or peers in the same industry.

Yield on cost (YOC) is a measure of profitability that is calculated based on the ratio of a share's current dividend to the price initially paid for that share.

Yield tilted index fund: a type of fund that invests in stocks or securities that reflect the holdings of a market index, but with a higher weighting toward higher-yielding investments. Vanguard High Dividend Yield ETF (VYM).

Yo-yo: A term for a highly volatile market. The name comes from the movements of the yo-yo toy; in a yo-yo market, stock prices rise and fall continuously.

A yo-yo market has no distinguishing features of a bull or bear market, but has characteristics of both.