question regarding the term "last in, last out, first in, first out"

[programAngel]

I have taken look at this website that shows the list of the most "riches" bitcoin holders.
https://bitinfocharts.com/top-100-riche ... esses.html

They are using the following terms:
1) First In
2) Last In
3) First Out
4) Last Out

What is the meaning of this terms?

Thanks

[johnjacobs]

I have an idea about what it is.

First in means the first time account was used
Last in means the most recent time when the account was used

First out probably means the first time the account was used for exchange (currency)
Last out probably means the most recent time of exchange of that account.