P
PCAOB - Public Company Accounting Oversight Board (body which oversees accounting firms involved in public company audits - companies listed on major stock exchanges and regulated by the SEC (Securities & Exchange Commission) )
PCI DSS - Payment Card Industry Data Security Standard (industry security standard for companies handling credit card/payment card data)
PCI SSC - Payment Card Industry Security Standards Council (industry organization of payment card vendors which develops and publishes standards for processing, transmitting, and storing payment card-related information)
PCMCIA - Personal Computer Memory Card International Association (organization that defines standards for connecting peripherals to miniaturized computers such as notebooks and laptops)
PhD - Doctor of Philosophy (advanced degree involving course work beyond a Masters Degree, and usually requiring research focusing on a specific area of study)
PMI - Project Management Institute (organization focusing on issues related to project management, in areas such as risk analysis)
PRMIA - Professional Risk Managers' International Association (Organization focusing on issues related to risk, certification, and offering information and educational services in the risk area.)