High School Term for an end state of expansion?

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The discussion centers on identifying a term for a hypothetical end state of the universe following an expansion similar to the Big Bang. Participants suggest "heat death" as the appropriate term, which refers to a state where all elemental particles are so distant that they no longer interact, resulting in a cold and immobile universe. The concept implies a final, thermodynamic equilibrium where energy is uniformly distributed. A link to a general article on the heat death of the universe is provided for further reading. The term effectively captures the envisioned scenario of ultimate cosmic isolation.
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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.
 
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'Heat death'.
 
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Thank you both. That is exactly what I was looking for.
 

Thread 'Reference frames, center of rotation, etc'

Topic about reference frames, center of rotation, postion of origin etc Comoving ref. frame is frame that is attached to moving object, does that mean, in that frame translation and rotation of object is zero, because origin and axes(x,y,z) are fixed to object? Is it same if you place origin of frame at object center of mass or at object tail? What type of comoving frame exist? What is lab frame? If we talk about center of rotation do we always need to specified from what frame we observe?
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