Same with industrial control ladder logic. It literally is a language based on old ladder electrical control diagrams which were popular for industrial machiner

Same with industrial control ladder logic. It literally is a language based on old ladder electrical control diagrams which were popular for industrial machinery. They were easy to follow as the logic sequence went from top to bottom. The rungs are a circuit and the vertical bars are the hot and return lines of the control power supply. |----||----||----() X1 X3 Y1 The above program is a series of two "contacts" (like a switch), the "-||-" symbol, and the output "coil" which is meant to symbolize a relay coil. Simple bit logic: if X1 and X3 are true, Y1 is set true. There are many more symbols like comparisons symbols such as -|<|- which will allow you to compare register/variable values as well as timers and other function blocks. Fun fact I learned: Many (all?) rail signal and control blocks are written in ladder with ALL valid states of that rail block predefined in ladder. The logic is simple but the task is incredibly critical. Supposedly it is much easier to visually verify/test the program using ladder vs a written language.