Quickly identifying claim based site

Scenario:
I love user group as you get question from every angle. I got a very simple question from one of the user. How do I know my site is already configured for claims ?

Solution:
If you login to your site and click on My Settings from Welcome menu , you will see clean Account name , with no weird characters :)



If claims is enabled you will see something like this. Notice those weird characters as prefix to account name.


Article:
In case you want to switch from Classic > Claims based or vice-versa, you can use my old article Enable Claim Based Authentication for existing web application