Term for an end state of expansion?

[Huck Mucus]

TL;DR

Do physicists have a name for the opposite of a singularity?

Whereas a singularity is everything together, is there a name for a proposed end state after a Big Bang or something similar? Is there a name for that situation (hypothetical or not) where each elemental particle is so far from every other elemental particle that nothing affects anything anymore, and we have a cold, dead, immobile (?) state?

Thanks.

 

[Bandersnatch]

'Heat death'.

 

[jim mcnamara]

General article on the heat death of the universe - theory:

https://en.wikipedia.org/wiki/Heat_death_of_the_universe

 

[Huck Mucus]

Thank you both. That is exactly what I was looking for.