"OtherScript" is the name of your other script. You don't literally type OtherScript unless your other script is actually and for real called OtherScript.js. Otherwise you use the script name. It will show up in the inspector once you fix any errors you have.

From the Unity Scripting Reference:

Global variables

You can also create global variables using the static keyword.

This creates a global variable called someGlobal.

// The static variable in a script named 'TheScriptName.js'
static var someGlobal = 5;

// You can access it from inside the script like normal variables:
print(someGlobal); someGlobal = 1;

To access it from another script you need to use the name of the script followed by a dot and the global variable name.

print(TheScriptName.someGlobal);
TheScriptName.someGlobal = 10;