Abbreviations & Acronyms Dictionary

Pacific Studies Initiative
Packaging signal
Packet Switch Interface
Packet Switched Interface
Packet Switching Interface
Packet System Information
Packetnet System Interface
Packetnet Systems Interface
Paid Service Indication
Pain Sensitivity Index
Pakistan Standards Institution
Pakistan Standards Institutions
Palestine Standards Institution
Palmar Sweat Index
Paper Ship Initiative
Paper Stock Institute
Parallel-Slit Interferometer
Parametric Subharmonic Instability
Parapsychology Sources of Information
Parapsychology Studies Institute
Parenting stress index
Parenting stress inventory
Park Scientific Instruments
Passive Solar Institute
Password Security Inspection
Patient Safety Indicators
Paul Scherrer Institute
Pavement Serviceability Index
Per Square Inch
Performance Systems International
Personal Subscription Identity
Personalized System Of Instruction
Personnel Security Investigation
Personnel Security Investigations
Pharmaceutical Society of Ireland
Phase Shift Interferometer
Photosystems I
Physical Security Inspection
Physical Space Inventory
Physician Service Income
Physiologic Stability Index
Physiological strain index
PI Scientific Instrument
Pirates Sick of Initials
Pitch Synchronous Innovation
Plan shear indicator
Plan-Speed Indicator
Planetary Science Institute
Planned Start Installation
Planning Systems Incorporated
Planning Systems, Inc.
Plant-specific insert
Plasma Sciences Inc.
Plasma Source Instrument
Plasma Surface Interactions
Plexin/semaphorin/integrin
Pneumonia Severity Index
Policy Studies Institute
Policy Support Instrument
Pollutant standard index
Pollutant Standards Index
Pollution standard index
Pollution Standards Index
Polymer Search on the Internet
Pont International Airline Services
Pool of Scientific Instruments
Population Services Institute
Population Services International
PORTA SYSTEMS CORP.
Portable Site Information
Position Specific Iterated
Positive Surface Ionization
Post-stimulus inhibition
Posterior sagittal index
Postpartum Support International
Postponing Sexual Involvement
Pound per Square Inch
Pounds per square inch
Power Static Inverter
Power Status Indicator
PowerShares Exchange-Traded Fund Trust
Practical Scale Index
Pre-Sentence Investigation
Pre-shipment Inspection
Precision Systems Inc.
Predictive Salvage Index
Preliminary site inspection
Preprogrammed Self-Instruction
Present Serviceability Index
President of the Service Institute
Pressure per Square Inch
Pressure system instruction
Pressure-Sensitive Identification
Primary shell integrity
Primordial Structure Investigation
Principal Specialist Inspector
Printed Subject Index
Prioritization of safety issues
Priority Solutions International
Probability of Success Indicator
Problem solving information
Problem Solving Inventory
Problem Source Identification
Process Safety Information
Process Solution Installer
Process to Support Interoperability
Processing Speed Index
Proctorial System of Instruction
Product Stewardship Institute
Product Support Information
Product Support Integrator
Product/Service Information
Professional Secretaries International
Professional Service Industries, Inc.
Professional Services Institute
Program Specific Information
Program-Specific Information
Programmable Serial Interface
Programmatic Serial Interface
Programme Specific Information
Programming Systems Information
Project Security Instruction
Project Starlight International
Proliferation Security Initiative
Proposal Submission Instruction
Proposal Submission Instructions
Propulsion System Interface
Prostaglandin synthetic inhibitor
Proteasome inhibitor
Protection Switch Inhibited
Protein Structure Initiative
Protein synthesis inhibition
Proteomics Standards Initiative
Protocol Specific Indication
Proximal small intestine
Pseudouridine
Psoriasis severity index
Psychiatric Society for Informatics
Psychiatric Symptom Index
Psychological Screening Inventory
Psychological services index
Psychology Student Instructor
Psychonomic Society, Inc.
Psychosocial intervention
Psychosocial interventions
Psychosomatic inventory
Public Sector Information
Public Service Identity
Public Services Infrastructure
Public services International
Public Software Institute
Published Subject Indicator
Puget Sound Initiative