What type of constant do I need to show a boolean display?

[l'andorrà]

I want to show a true/false display menu in some of my input parameters but I simply can't find the mql4 documentation showing what type of constant should I use for that. Could someone please help?

[vish]

[l'andorrà]

What I mean is what I need to type here...

...to get this in my input parametres' EA:

[roar]

@l-andorrà its "bool".
https://docs.mql4.com/basis/types

[l'andorrà]

Great! Thank you.