REPLICANT -- A genetically engineered creature composed entirely of organic substance. Animal replicants (animoids) were developed first for use as pets and beasts of burden after most real animals became extinct. Later, humanoid replicants were created for military purposes and for the exploration and colonization of space. The Tyrell Corp. recently introduced the Nexus 6, the supreme replicant -- much stronger and faster than, and virtually indistinguishable from, real human beings. Earth law forbids replicants on the planet, except in the huge industrial complex where they are created. The law does not consider replicants human and therefore accords them no rights nor protection.

ESPER -- A high-density computer with a very powerful three- dimensional resolution capacity and a cryogenic cooling system. The police cars and Deckard's apartment contain small models which can be channeled into the large one at police headquarters. This big apparatus is a well-worn, retro-fitted part of the furniture. Among many functions, the Esper can analyze and enlarge photos, enabling investigators to search a room without being there.[The January 1995 issue of NASA Tech Briefs includes a description of an Esper-like machine called Omniview.]

VOIGHT-KAMPFF MACHINE -- A very advanced form of lie detector that measures contractions of the iris muscle and the presence of invisible airborne particles emitted from the body. The bellows were designed for the latter function and give the machine the menacing air of a sinister insect. The VK is used primarily by blade runners to determine if a suspect is truly human by measuring the degree of his empathic response through carefully worded questions and statements.

SPINNER -- The generic term for all flying cars in use around the year 2020. Only specially authorized people and police are licensed to operate these remarkable vehicles, which are capable of street driving, vertical lift-off, hovering and high-speed cruising. The Spinner is powered by three engines -- conventional internal combustion, jet and anti-gravity.  [Syd Mead explained in subsequent articles that the concept was actually one of internal lift like that used in vertical take-off aircraft today--NOT anti-gravity.]