jargon in land investments

Brownfield - a site that has previously been developed. Brownfield sites may have been used for a wide variety of former activities including, commercial buildings, housing, industry, airfields, parks and so on. These sites may even be still in use and are not necessarily ready for development.
Capital - The amount of money you invest is usually referred to as your capital.
Capital Gain - The amount your investment increases during the period of investment.
Clawback Covenant - A legal arrangement that allows a former owner to maintain a financial interest in a piece of land. It will entitle them to some of the proceeds of a subsequent sale.
Contract for Sale - This is the name of the legal document that covers any land sale in the UK and you should always carefully check the terms in it.
Covenant - Covenant is another word for an obligation on the part of an individual which is defined in a legal document. In UK land, covenants often appear on title deeds and prohibit certain uses of that land.
Density - When refering to UK land, density describes the number of buildings (usually homes) per acre.
DPP - Detailed planning permission
Deeds - These are the ownership documents issued by the Office of H.M. Land Registry.
Depreciation - The reduction in the value of an item over time.
Freehold - The title deeds of your land can be subject to different terms, freehold means that you have absolute ownership of the land as opposed to Leasehold where you are in effect renting it for an extended period.
Green Belt - Areas of land usually around towns and cities that are currently protected from development, although the Government is currently reviewing this policy.
Greenfield - An undeveloped site that is ready for development.
H. M. Land Registry - The UK government body responsible for tracking ownership of the land.
LDP - Local Development Plan. The local council's plan for its future building programme.
OPP - Outline planning permission
Open Countryside - Open farmland and fields that doesn't have the infrastructure nearby that is needed for development.
Return on investment (ROI) - Similar to Capital Gain, this simply means how much money did you make over and above your original investment. Often described as a % so if you put in £10k and got back £50k you made a 400% return on your original investment.
SSSI - Site of special scientific interest. Land that is heavily protected against development for reasons such as the flora, fauna or archaeological value of the site.
Title - In UK law, the Crown ultimately owns all of the land but grants ownership by title to others.
UDP - Unitary Development Plan. See LDP as they essentially are the same thing.