A monadnock /məˈnædnɒk/ or inselberg is an isolated rock hill, knob, ridge, or small mountain that rises abruptly from a gently sloping or virtually level surrounding plain.

In southern and southern-central Africa, a similar formation of granite is known as a kopje, a Dutch word from which the Afrikaans word koppie was derived.

If the monadnock is dome-shaped and formed from granite-gneiss, it can also be called a bornhardt.

Monadnock is an originally Native American term for an isolated hill or a lone mountain that has risen above the surrounding area, typically by surviving erosion. Geologists took the name from Mount Monadnock in southwestern New Hampshire. It is thought to derive from the Abenaki language, from either menonadenak ("smooth mountain") or menadena ("isolated mountain"). In this context, monadnock is used to describe a mountain that rises from an area of relatively flat and/or lower terrain. For instance, Mount Monadnock rises 2,000 feet (610 m) above its surrounding terrain and stands, at 3,165 feet (965 m), nearly 1,000 feet (300 m) higher than any mountain peak within 30 miles (48 km).

Seeds of Hope was a plowshares group of women who totally demolished a Hawk fighter jet in England. Like they stated in the explanatory video film left in the aircraft after the action, they wanted to inspire hope instead of violence and greed, hence the name. The group was also called the Warton Four.

On the 29 January 1996, Andrea Needham, Joanna Wilson and Lotta Kronlid - known as the 'Ploughshares Four' - broke into the British Aerospace factory in Lancashire and caused £1.7m worth of damage to BAe Hawk number ZH955, a training aircraft that was to have been supplied along with 23 other jets to the New Order regime of Indonesia.

Accused of causing, and conspiring to cause, criminal damage, with a maximum ten year sentence, they argued that what they did was not a crime but that they "were acting to prevent British Aerospace and the British Government from aiding and abetting genocide". Meaning the one taking place in East Timor. They were acquitted by the jury.