From The Free On-line Dictionary of Computing (19 January 2023):
E
1. An extension of C++ with database types and
persistent objects. E is a powerful and flexible
procedural programming language. It is used in the Exodus
database system.
See also GNU E.
(ftp://ftp.cs.wisc.edu/exodus/E/).
["Persistence in the E Language: Issues and Implementation",
J.E. Richardson et al, Soft Prac & Exp 19(12):1115-1150 (Dec
1989)].
2. <language> A procedural language by Wouter van
Oortmerssen with semantics similar to C. E features
lists, low-level polymorphism, exception handling, quoted
expressions, pattern matching and object inheritance.
Amiga E is a version for the Amiga.
(1999-10-05)