WPI, a three-letter acronym, may stand for:

β-Lactoglobulin and WPI aggregates: Formation, structure and applications
NIH funds WPI study aimed at engineering more natural and durable replacement heart valves
Dietary fatty acid-induced alterations of hepatic microsomal drug metabolism.
Characterization of Poxvirus A51 Protein Using Yeast-Two Hybrid Screening
Playing With Delay: With Poor Timing Comes Poor Performance, and Experience Follows Suit
Automatic Eye-Gaze Following from 2-D Static Images: Application to Classroom Observation Video Analysis
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Refining Prerequisite Skill Structure Graphs Using Randomized Controlled Trials
Likelihood Inference for Order Restricted Models
Learning and change in organisations: Cases and perspectives from aesthetic approaches. Book review: Ian W. King & Jonathan Vickery...