Polyhedra is a family of relational database management systems offered by ENEA AB, a Swedish company.
 The original version of Polyhedra (now referred to as Polyhedra IMDB) was an in-memory database management system which could be used in high availability configurations; in 2006 Polyhedra Flash DBMS was introduced to allow databases to be stored in flash memory.
 All versions employ the client–server model to ensure the data are protected from misbehaving application software, and they use the same SQL, ODBC and type-4 JDBC interfaces.
 Polyhedra is targeted primarily for embedded use by Original Equipment Manufacturers (OEMs), and big-name customers include Ericsson, ABB, Emerson, Lockheed Martin, United Utilities and Siemens AG.
The MICRO Relational Database Management System was the first large-scale set-theoretic database management system to be used in production.
 Though MICRO was initially considered to be an "Information Management System", it was eventually recognized to provide all the capabilities of an RDBMS.
 MICRO's major underpinnings and algorithms were based on the Set-Theoretic Data Structure (STDS) model developed by D. L. Childs of the University of Michigan's CONCOMP (Conversational Use of Computers) Project.
 MICRO featured a natural language interface which allowed non-programmers to use the system.
A relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model invented by Edgar F. Codd, of IBM's San Jose Research Laboratory.
 As of 2017, many of the databases in widespread use are based on the relational database model.
An object database (also object-oriented database management system, OODBMS) is a database management system in which information is represented in the form of objects as used in object-oriented programming.
 Object databases are different from relational databases which are table-oriented.
 Object-relational databases are a hybrid of both approaches.
Empress Embedded Database is a relational database management system that has been embedded into applications, including medical systems, network routers, nuclear power plant monitors, satellite management systems.
 Empress is an ACID compliant relational database management system (RDBMS) with two-phase commit and several transaction isolation levels for real-time embedded applications.
 It supports both persistent and in-memory storage of data and works with text, binary, multimedia, as well as traditional data.
An object-relational database (ORD), or object-relational database management system (ORDBMS), is a database management system (DBMS) similar to a relational database, but with an object-oriented database model: objects, classes and inheritance are directly supported in database schemas and in the query language.
 In addition, just as with pure relational systems, it supports extension of the data model with custom data-types and methods.
CA IDMS (Integrated Database Management System) is primarily a network (CODASYL) database management system for mainframes.
 It was first developed at B.F. Goodrich and later marketed by Cullinane Database Systems (renamed Cullinet in 1983).
 Since 1989 the product has been owned by Computer Associates (now CA Technologies), who renamed it Advantage CA-IDMS and later simply to CA IDMS.
United Utilities Group PLC (UU), the United Kingdom's largest listed water company, was founded in 1995 as a result of the merger of North West Water and NORWEB.
A column-oriented DBMS (or columnar database management system) is a database management system (DBMS) that stores data tables by column rather than by row.
 Practical use of a column store versus a row store differs little in the relational DBMS world.
 Both columnar and row databases can use traditional database query languages like SQL to load data and perform queries.
 Both row and columnar databases can become the backbone in a system to serve data for common extract, transform, load (ETL) and data visualization tools.
 However, by storing data in columns rather than rows, the database can more precisely access the data it needs to answer a query rather than scanning and discarding unwanted data in rows.
 Query performance is often increased as a result, particularly in very large data sets.
ODABA is a terminology-oriented database management system, which is a conceptual extension of an object-oriented database system, and implements concepts defined in a terminology model.
 ODABA supports typical standards and technologies for object-oriented databases, but also terminology-oriented database extensions.
 ODABA also behaves like an object-relational database management system, i.e. data is seen as being stored in a database rather than accessing persistent objects in a programming environment.
 ODABA supports active data link (ADL) and provides an ADL-based GUI frame work.

Question: What UK water company is listed among the big-name customers of the Polyhedra database management system?
Answer: United Utilities Group PLC