Marilyn Hills In the UK
According to Wikipedia: A Marilyn is a mountain or hill in the United Kingdom, Republic of Ireland or Isle of Man with a prominence of at least 150 metres (492 ft), regardless of absolute height or other merit. The name was coined as a punning contrast to the designation Munro, used of a Scottish mountain with a height of more than 3,000 feet (914.4 m), which is homophonous with (Marilyn) Monroe.
Recommended Reading:
The Relative Hills of Britain: Mountains, Munros and Marilyns (A Cicerone guide)