Type of mouse that has a ball located on the bottom that rolls around on a flat surface as the mouse is moved. Sensors inside the mouse determine the direction and distance of the movement - Input. Optical mouse. Type of mouse that uses a laser to detect the mouse's movement and has no moving parts - Input.
The Strategic Defense Initiative (SDI) was a proposed missile defense system intended to protect the United States from attack by ballistic strategic nuclear weapons (Intercontinental ballistic missiles and Submarine-launched ballistic missiles).
RSI Indicator - Relative Strength Index. Relative Strength Index (RSI) is a popular momentum oscillator developed by J. Welles Wilder Jr. and detailed in his book New Concepts in Technical Trading Systems. The Relative Strength Index compares upward movements in closing price to downward movements over a selected period.