ppi

1. abbreviationinitialismuncountableInitialism of pixels per inch.
2. abbreviationinitialismuncountablebusinessInitialism of picks per inch

   Although Tina used a slightly heavier yarn for the stripes in Towel 3, she was still able to achieve 23 ppi.

   2026, Tina Glassenbury, “Hawk Moth Dish Towels”, in Handwoven, volume XLVII, number 1, page 56

plural PPIs

1. abbreviationinitialismeconomicsInitialism of producer price index.
2. abbreviationinitialismgraphicsInitialism of pixels per inch.
3. abbreviationinitialismbiochemistryInitialism of proton-pump inhibitor.
4. abbreviationinitialismbiochemistryInitialism of protein–protein interaction.

   2010, Kodama and Hu, "An improved biomolecular flourescence complementation assay with a high signal-to-noise ratio", BioTechniques, vol 49, no 5, pg. 793. in abstract This improved Venus-based BiFC system will facilitate PPI studies in various biological research fields.

5. abbreviationinitialismmedicineInitialism of patient and public involvement.
6. MormonismabbreviationinitialismInitialism of personal priesthood interview.
7. abbreviationinitialismInitialism of payment protection insurance.
8. abbreviationinitialismhuman sciencesInitialism of positive polarity item.