What is the definition of pointer?

What is the definition of pointer?

Conceptually a Conceptually, a "pointer" is just something that "points"
to something else;Is this definition is sufficient to tell exactly what a
pointer is in programing languages? Does it need to have any other
features?
Programmers who come from specific language may have pre-conceived ideas
of what constitutes a 'pointer' based on how it is used in the language So
let say if he is from c/c++ language, he say's pointers supports pointer
arithmetic.Is pointer arithmetic an essential feature of a pointer?
Go has pointers and does not support pointer arithmetic. Is the ability to
"dereference" the pointer essential to the concept of a pointer?
So what is the precise definition of pointer i can answer irrespective of
specific programming language?
Thanks in Advance for your help!