Key Lot:
A term used refered to a specific piece of real estate property that sits in an important location and has added value because of its strategic location in relation to other pieces of property.

This term can also apply to a lot with less value, usually created when a developer splits lots and needs to change the shape of one to make the others fit in around it. In that case, key lot may have less value because of the odd shape, lack of privacy, or when lot is not big enough to accommodate a house.

Keystone:
A wedge like central stone at the summit of an arch, locking the whole together.

Kiosk:
A kiosk is a small, separated garden pavilion open on some or all sides. Also a small open fronted booths, huts or cubicles from which services and goods like newspapers, refreshments, tickets, etc., are sold.

The word electronic kiosk is sometimes applied to freestanding computer terminals.

Touchscreen kiosks are commercially used as industrial appliances, reducing lines, eliminating paper, improving efficiency and service. Their uses are unlimited from refrigerators to airports, health clubs, movie theaters and libraries.

Kicker:
A term referring to an extra bonus or additional payment over and above principal and interest paid to an investor or some other deal over and above usual terms related to a specific transaction.

Knob and Tube Wiring:
Knob and tube wiring (sometimes abbreviated K&T) was an early standardized method of electrical wiring in buildings, in common use in North America from about 1880 to the 1930s. It consisted of single-insulated copper conductors run within wall or ceiling cavities, passing through joist and stud drill-holes via protective porcelain insulating tubes, and supported along their length on nailed-down porcelain knob insulators. Where conductors entered a wiring device such as a lamp or switch, or were pulled into a wall, they were protected by flexible cloth insulating sleeving called loom. The first insulation was asphalt-saturated cotton cloth, then rubber became common. Wire splices in such installations were twisted together for good mechanical strength, then soldered and wrapped with rubber insulating tape and friction tape (asphalt saturated cloth), or made inside metal junction boxes.

Knob and tube wiring was eventually displaced from interior wiring systems because of the high cost of installation compared with use of power cables, which combined both power conductors of a circuit in one run (and which later included grounding conductors).

Insurance companies are increasingly cautious about knob and tube wiring and in most cases will not renew insurance policies with new ovner because of hazard of overloading or insulation breakdown.