Abbreviation for Picture Signal Improvement.

Pressure per inch squared Quarter

A common unit for expressing pressure measurements.

Used to tell you the amount of pressure a high pressure air tank will hold, the more pressure the more shots per tank. Common pressures for paintball are 3000PSI and 4500PSI.

generic term for person-environment interactions which cannot be understood on the basis of known sensory, mechanical or energetic systems. Psi can be both projective (PK) and receptive (ESP).

A general term which refers to the factor(s) responsible for parapsychological phenomena. Originally derived from the use of the greek letter psi to denote the unknown quantity in an equation.

The 23rd letter of the Greek alphabet, standing for parapsychological abilities and phenomena (e.g., recognition, telepathy, telekinesis, etc.)

The 23rd. letter of the Greek alphabet (). Used to refer to theoretically verifiable Transpersonal Experiences — experiences of transpersonal perception (Extra-Sensory Perception [ESP]) and experiences of transpersonal influence (PsychoKinesis [PK]) — collectively. See text, Chapters 1 and 11. See also, "Extra-Sensory Perception," "psi-related," "PsychoKinesis" and " Transpersonal Experiences."

Pre-sentence Investigation

Preliminary Site Investigation

Presentence investigation report prepared by court assigned probation officer that includes criminal history, identifiers, offense summary, offender's background, and sentencing recommendation.

Permanent Subcommittee on Investigations

Pollutant Standards Index. a system developed by the federal government for reporting air pollution concentrations to the public as numerical values between 0 and 500

Pollutant Standard Index. a calculation by formula of the degree to which air quality relates to the standards set by the EPA for each of the major pollutants.

Pollutant Standard Index. Measure of adverse health effects of air pollution levels in major cities.()

Pollution Standards Index

Psi is a program for connecting to the Jabber messaging network. It supports multiple accounts, group chat, and translations . Client/server encryption is supported through SSL.

Psi aims to be a powerful ICQ-like Jabber client for the experienced Jabber user. There are builds available for Windows, Linux, and MacOS X.

Psi is a GPLed instant messaging client for the Jabber (XMPP) protocol which uses the Qt toolkit. It runs on Linux, Microsoft Windows, and Mac OS X. Ready-to-install RPM and deb packages are available for many Linux distributions.