| CAPA | Corrective Action Preventive Action [engl.] Massnahme zur Vermeidung nachträglicher Änderungen |
| t. | total |
| tot. | total |
| B.A. | bonne action [frz.] "Die tägliche "gute Tat" der Pfadfinder" |
| CPA | Cost-Per-Action Online-Marketing Kenngröße |
| HAI | Health Action International Amsterdam, http://www.haiweb.org |
| MPA | Minimum Perceptable Action |
| PAC | Political Action Committee |
| MIA | Missing In Action [engl.] im Kampf vermisst |
| ECA | Event, Condition, Action |
| UAR | User Action Routine |
| KMAL | Kinetic Mass Action Law |
| KIA | Killed In Action [engl.] im Kampf gefallen |
| TOC | Total Organic Carbon |
| TOC | Total Cost of Ownership |
| TNV | Total Network Visibility |
| TQC | Total Quality Control |
| TPM | Total Productive Maintenance |
| TBO | Total Benefits of Ownership |
| TIA | Total Information Awareness |
| TCO | Total Cost of Ownership Berechnungsverfahren in der Betriebswirtschaftslehre |
| TOX | Total Organic Halogen |
| T. L. O. | total loss only [engl.] Versicherung nur gegen Totalverlust |
| TACS | Total Access Communications |
| TAN | Total Area Network |
| TSD | Total System Design |
| TIER | Total Indoor Environmental |
| TOSS | Total Suppression of Sidebands |
| TVD | Total Virus Defense |
| TQM | Total Quality Management |
| TSA | Total Surface Area |
| BAP | Biodiversity Action Plan [engl.] |
| ASH | Action on Smoking and Health [engl.] Britische Antirauchergruppe |
| AIDA | Attention, Interest, Desire, Action AIDA-Prinzip: Abkürzung für die wichtigsten Aufgaben, die eine Werbung zu erfüllen hat |
| BAM | Boyan Action Module [engl.] |
| CAQ | Covert Action Quarterly [Zeitschrift] New York, [NY], http://www.covertaction.org |
| LAG | least-action ground state approximation |
| JTAG | Joint Test Action Group |
| FACS | Facial Action Coding System |
| PLAN | Public Lands Action Network |
| FRAG | Flood Risk Action Groups |
| For. Fr. action for. | Forêts de France et action forestière Zeitschrift |
| CAT | Continuous Action Tamping [engl.] Kontinuierliches Gleisstopfverfahren |
| TRIX | Total Rate Imaging of X-rays |
| TVOC | Total Volatile Organic Compounds |
| TXRF | Total-reflection X-Ray Fluorescence analysis |
| TCF | Total Cash Flow Ansatz Verfahren der Unternehmensbewertung |
| ATI | Average Total Inspection [engl.] Durchschnittliche Anzahl der geprüften Elemente in der Qualitätssicherung |
| ATR | Attenuated Total Reflection [engl.] |
| AIAG | Automotive Industry Action Group [engl.] Southfield, [MI], http://www.aiag.org |