In financial markets, the lowest amount of money required to trade on an instrument and open a position is called the "margin". Another name for Margin is collateral. Margin is a term that is often encountered by investors who trade leveraged in the futures market and forex markets. This term is used more as "initial margin" in trading platforms.
A take-profit order is an order used by traders to ensure stocks are sold when they have reached a certain level, which has been chosen by the investor, above the purchase price.