"TFP Lifetime" badge...

[Mimipell521]

...what does it mean?
I see the ones for the site moderators and admins, I see the different level "supporter" badges, and I see the "TFP Expert" badges. What does "TFP Lifetime" mean? It's probably simple, but I am going crazy trying to figure it out...

 

[Deb04]

It's left over from the days before the supporter levels were created. At that time, the was only one level, "TFP Lifetime Supporter"