AOA is one of the most important parameters for understanding airplane performance and handling (see What Is Angle of Attack?) because a typical wing has a limited range of angles of attack over which it can function efficiently. In its simplest form, lift is a function of speed, air density, wing area, and AOA.
Day trading is speculation in securities, specifically buying and selling financial instruments within the same trading day. Strictly, day trading is trading only within a day, such that all positions are closed before the market closes for the trading day. Many traders may not be so strict or may have day trading as one component of an overall strategy. Traders who participate in day trading are called day traders.
A broker-dealer may also designate a customer as a âpattern day traderâ if it âknows or has a reasonable basis to believeâ that a customer will engage in pattern day trading. For example, if a customerâs broker-dealer provided day trading training to such customer before opening the account, the broker-dealer could designate that customer as a âpattern day trader.â Under FINRA rules, customers who are deemed âpattern day tradersâ must have at least $25,000 in their accounts and can only trade in margin accounts.