Plus/Minus vs Minus/Plus?

Question

IT terminology

Good afternoon.
Please tell me which wording is more correct:

• On/Off vs Off/On
  
• Open/Close vs Close/Open
  
• +/- vs -/+
  
• etc.
  

A few real life examples:

• In the program, you need to make a parameter that will determine the time for the full opening / closing of the valve. How to call this parameter: Full open/close time or Full close/open time ?
  
• For example, in the program you need to create 2 parameters: Full opening time and Full closing time . Which of these parameters should be the first in the list of parameters?
  

It seems to be more common +/- than -/+ , but why - after all, the first element always represents 0 , the second 1 , the third 2 , etc. (zero is more suitable for minus, off, closed, etc.)?

Answer 1

Listen, I always confuse... What's the right way? June or July? Iran or Iraq?

Answer 2

IMHO the order may depend on the default value. If the valve is designed to relieve pressure and is closed by default, then the documentation can indicate the opening / closing time - in the order in which states are received.
If a set of the same type of elements with a different start state or an element with an indefinite start state is described, then (again IMHO) it is better to take a pair according to the “add state” / “remove state” principle. I mean "+/-", "open/close", "turn on/off", "fell/wrung out".

Answer 3

It seems to me that the default value should go first.