Nielsen is a lunar impact crater at the coordinates 31.8° N, 51.8° W on the Oceanus Procellarum north-east of Montes Agricola on the western hemisphere of the Moon.

A broadcast rating and research company that gathers information on audience demographics.

The A. C. Nielsen Co. was founded in 1939 in the USA. It offers a wide range of marketing research services in Australia, the USA and the U.K. including the well-known shop auditing service, the Nielsen Index.

an associate professor in the department of physics at the University of Queensland in Brisbane, Australia