Close Encounter of the First Kind (CE-1): Observation of a UFO within 500 feet.

Close Encounter of the Second Kind (CE-2): Trace evidence of either a landing or a radar lock-on.

Close Encounter of the Third Kind (CE-3): Observation of humanoids, usually associated with UFO activity.

Close Encounter of the Fourth Kind (CE-4): Interaction with humanoids, usually aboard a UFO.

Close Encounter of the Fifth Kind (CE-5): Human-initiated contact or interaction with Extraterrestrial Intelligence or beings, often associated with UFO activity or other CE-5 contact levels.

ETI: Extraterrestrial Intelligence

EBE: Extraterrestrial Biological Entity

Coherent Thought Sequencing (CTS): Specifically sequenced mental visualization projected only after reaching a state of unbound mind or expanded consciousness.

Contact Trilogy: CSETI communication protocols designed to establish a CE-5 with EBEs, ETS or ETI by using modalities of light, sound, and thought (see CTS).

High Strangeness: The inexplicable effects and synchronicity of events related to and occurring before, during, and after research missions, various Close Encounters or UFO/ETS sightings.

Lock-On: The moment when intelligent signaling or coherent thought to a spacecraft and its occupants is returned in kind.

RMIT: Rapid Mobilization Investigation Team - A CSETI group of researchers and scientists who are "on call" to respond to significant UFO/ETI/ETS activity.

UFO: Unidentified Flying Object

UFO Wave: Multiple UFO sightings in a specific geographic area over a relatively short period of time. Also called a "flap".