NITRO Site Settings
We have introduced the concept of Site-level variables which can be used in NITRO Forms (now) and will be available in other NITRO apps soon. In this first iteration of Site-level Variables, the options for the type of variable are Text and Yes/No:
When setting permissions tabs, sections, fields, or buttons on a NITRO Form, you can use the Site-level variable in the Advanced Condition, like below:

The full text from the last field: [Title|Title],,NITROSVEX##value.
To create a variable, go to NITRO Site Settings -> Site Level Variable:

Edit an existing variable or create a new one. You can enter the Title and the Key will automatically populate. Choose the Type (Text or Yes/No) and then assign a value to the variable.