What do these numbers mean?

[BarkhornXX13]

Can someone tell me what the #2 signifies at 43:20 on this clip?

https://www.youtube.com/watch?v=3OPZtqjfvP4&t=1553s&ab_channel=RatherIncoherent

I've seen these pop up from time to time and I'm mystified as to their significance.

Thanks in advance.

[Hooahguy]

I believe its a way to help players click on an army or city when there is something adjacent to it. Definitely seems to be something from the mobile version where it might be hard for your finger to click on something thats close to something else, but now it just feels out of place.

[BarkhornXX13]

Yeah, I figured it was something like that. Thanks.