Their stems are typically flattened, almost leaf-like in appearance, with fewer or even no spines, such as the well-known Christmas cactus or Thanksgiving cactus (in the genus Schlumbergera). Cacti have a variety of uses: many species are used as ornamental plants, others are grown for fodder or forage, and others for food (particularly their fruit).
1 Car of Tomorrow, a car design used in NASCAR racing. 2  Cost of transport, an energy calculation. 3  Cotangent, a trigonometric function, written as cot.  Cotyledon, a significant part of the embryo within the seed of a plant.
Contracting Officer's Technical Representative. A Contracting Officer's Technical Representative (COTR) is a business communications liaison between the United States government and a private contractor. He or she ensures that their goals are mutually beneficial.