Consider the following SQL statements:
select ename, init, job from emp where deptno = 20;
We could have written this statement as follows: Using Tuple Variables in a Query
select e.ename, e.init, e.job from emp e where e.deptno = 20;
Here, e is a tuple variable.
In Oracle, tuple variables are referred to as table aliases, and the ANSI/ISO standard calls it correlation names.