"T" Idiot light question

[Laldog]

I hesitate to use the word idiot in the title of my post. It seems too appropriate, but here goes...

One of my "instrument lights" shining brightly is a white "T".

Can't find it the owners manual.

What does it represent??

 

[Stevehose]

Gas tank reserve light - goes on when almost out of fuel. If it's on when you know you have plenty of gas then check the sending unit in the tank.