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adrian_b | on: Tony Hoare has died
"Reference" was the original term used in the languages derived from ALGOL for what is now called "pointer".

The distinction that exists in C++ between "reference" and "pointer" is something very recent. In the past the 2 terms were synonymous.

The term "pointer" was introduced by IBM PL/I in July 1966, where it replaced "reference".

PL/I has introduced many terms that have replaced previously used terms. For example:

reference => pointer

record => structure

process => task

and a few others that I do not remember right now.

"Pointer" and "structure" have become dominant after they have been taken by the C language from PL/I and then C has become extremely popular. Previously "reference" and "record" were more frequently used.

Milpotel | parent
But the "references" in Euler seem to be close to references nowadays. There is no access to the address, no pointer arithmetic etc. such as in PL/I.
adrian_b | root | parent
Euler had both an address-of operator, which was prefix "@" and an indirect addressing a.k.a. pointer dereferencing operator, which was a postfix middle dot.

So it had everything that C has, except pointer arithmetic.

Only a subset of the programming languages that have pointers also allow pointer arithmetic, because many believe that whenever address arithmetic is needed only indices shall be used, not pointers, because with indices it is much easier for the compiler to determine the range of addresses that may be accessed.