Where to put a "global variable" for the entire website

[eluser]earlyriser[/eluser]
Hi.

I am making a site with the name "This is my temp name" and the only way I have found to pass this name in the a content view is with a $data['name'] = "This is my temp name". It happens I have multiple controllers where I have to do the same thing, then if the namesite changes, I will have to change it in different places.

I'm sure there is a way to declare the sitename in just one place and make the call to this variable from any controller, but I don't how. Maybe in the config file?

How do you do this?