Delta
Delta is the option Greek that estimates how much an option's price changes for a one-unit move in the underlying price, holding other factors constant. Call deltas range from 0 to +1 and put deltas from −1 to 0.
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Diversification
Diversification is spreading capital across holdings whose returns do not move in perfect step, so that the combined portfolio is less volatile than the weighted average of its parts. It mainly reduces risks specific to one company, sector or asset.
Dividend
A dividend is a distribution of part of a company's profits or reserves to its shareholders, most often paid in cash and declared per share. Dividends are decided by the board and are not guaranteed.
Dividend Yield
Dividend yield expresses a stock's annual dividend as a percentage of its current share price. It shows the cash income a share pays relative to its price, not the total return.
Drawdown
Drawdown is the percentage decline of an investment, account or strategy from its previous peak value to a later low. Maximum drawdown is the largest such peak-to-trough fall over a chosen period.
Duration
Duration measures how sensitive a bond's price is to changes in interest rates, expressed in years. Macaulay duration is the present-value-weighted average time to receive the bond's cash flows, and modified duration converts it into an approximate percentage price change for a one percentage point change in yield.