Just based on the four that we are discussing, it is easy to apply some tests for exclusivity.
Not all users are customers (i.e. paying users), while all customers would probably be users.
All UI form part of the user experience, but not all user experience is confined to the UI (e.g. physical stores)
Brand experience (which dictates aspects of the product ...
There isn't single theory in the context of nomenclature - UX and UI started to differentiate in the industry - as occupations or scopes of activities.
However, the CX and BX context - may exist in a broader brand and marketing context.
CX - Customer Experience
Is how the client experience during a given process (e.g. purchasing a service, item, etc.)
I'm not sure if there is an actual name for this other than an approximate count but I believe there may be two reasons why it was implemented this way.
Firstly, an accurate number doesn't really provide much benefit to the user. The average user is probably not going to spend time analysing exactly which post has more likes than another post and only ...