What is an ordered list of numbers?

Answer 1

Chronological order

An ordered list of numbers is a "numerical sequence".

Answer 2

That means that you have a list of numbers, and that the order matters. This is often the case with coordinates - for example, it's not the same to go 10 blocks to the east and then 1 block north, than to go 1 block to the east and then 10 blocks north. That is, you don't end up in the same location.