Snowdon - Yr Wyddfa

A Marilyn is any mountain in Britain or Ireland with a prominence over 150m, regardless of height.

A Hump (Hundred and upwards Metre Prominence) is any mountain in Britain or Ireland with a prominence over 100m, regardless of height.

A Simm is any mountain in Britain or Ireland with a prominence over 30m and a height above 600m.

A Furth is any peak in England, Wales or Ireland with a height above 3000ft

A Hewitt (Hill in England, Wales and Ireland over Two Thousand) is a mountain in England, Wales or Ireland with a height over 2,000ft and a prominence greater then 30m.

A Nuttall is a mountain in England or Wales with a height over 2000ft and a prominence greater then 15m

The Trail 100 list is a list of "must climb" mountains in the United Kingdom.

A Bridge is a peak featured in George Bridge's book: Mountains of England and Wales: Tables of the 2000ft Summits

An Historic County Top is a peak in one of the traditional historic counties.

A Buxton & Lewis is a peak featured in the book by Chris Buxton and Gwyn Lewis, "Mountain Summits of England and Wales".

A Current County/UA Top is the highest peak in a current administrative county or Unitary Authority of Britain.

A Administrative Country Top is the highest peak in one of the traditional administrative (1974-1996) counties.

The Welsh 3000s includes every peak in Wales over 3000ft in height