What am I?

I start with “T”, ends with “T”, and within me is “T”. What am I?

related riddles

I am a word with two meanings. With one I can be broken, with the second I hold on. What am I?

You carry me everywhere, even at night and I can also be a flashlight. What am I?

You may enter, but you may not come in, I have space, but no room, I have keys, but open no lock. What am I?