The creator (/u/Vocatus) of Tron states that the name comes from the movie âTronâ and âhow Tron fights for the userâ. This fight is quickly realized when you run this software and see how itâs really a âtouch once and doneâ cleaning system.
The AOA (Angle of Attack) gauge in an aircraft will let the pilot know when he is at the correct approach / climbout speed. This indicator is correct even though the aircraft's weight may vary. Also, the gauge provides a visual warning of an impending stall.
An indicator is a large organic molecule that works somewhat like a  color dye. Whereas most dyes do not change color with the amount of acid or base present, there are many molecules, known as acid - base indicators, which do respond to a change in the hydrogen ion concentration. Most of the indicators are themselves weak acids. The most common indicator is found on litmus paper.