Among other things, it may refer to a non-standard (non-SI) unit of pressure, "pounds per square inch". Psi is a Greek letter in the Greek alphabet (uppercase Ψ) (lowercase ψ). When it is used in...
In the SI system the pressure unit is the Pascal (after the French maths genius) which is defined as 1 Newton per square meter. This is a very small unit. Atmospheric pressure is about 105 Pascals,...
It stands for "Pre-sentence Investigation". It is usually a report written by the respective county probation department after the plea hearing and before the sentencing hearing. It is given to the...