- PACT (compiler), a series of compilers for the IBM 701 and 704 computers
- Protein ACTivator of the interferon-induced protein kinase, a protein encoded by the PRKRA gene
- Powdered activated carbon treatment, a wastewater treatment technology
- Programme of Action for Cancer Therapy, an IAEA project on radiation medicine
- Positioning Advertising Copy Testing, a document detailing features of a Good Copy Testing System
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