What is this notation called ?

Question

Class names can be abbreviated as follows:

CustomerService => CS
CustomerPaymentService => CPS
UnpaidBillRetriever => UBR
FindAnyRemainingOpenUserTrasactions => FAROUT

This is supported by control-N (idea) or control-shift-T (eclipse). After some initial re-learning I now use this naming strategy heavily. But what is it called ?

Answer 1

I would call it an acronym.

Answer 2

May be 'alias'?

Answer 3

It's called Camel-Case. Since you would only take the upper letters.