| Abbreviation | Definition |
|---|---|
| NASA | National Annoying Sister Association |
| NASA | National Association of Space Astronauts |
| NASA | Need Another Seven Astronauts |
| NASA | Negative Attitudes Scuttle Astronautics |
| NASA | Nerds Are Searching for Answers |
| NASA | Never A Straight Answer |
| NASA | Never Absolutely Sure of Anything |
| NASA | Never Admit Seeing Anything |
| NASA | Never Any Satisfying Answers |
| NASA | New Airwalk Shoes Accepted |
| NASA | No Access to Space Allowed |
| NASA | No Access to Space for Americans |
| NASA | Noodle Arrangement Society of America |
| NASA | Nosey Alien Seekers Association |
| NASA | Not A Shuttle Anymore |
| NASA | Not All Shuttles Arrive |
| NASC | Nottingham Arabidopsis Stock Centre |
| NASCAR | National Association of Scary Cars At Races |
| NASCAR | National Association of Society's Cancer Advertised in Races |
| NASCAR | Nearly All Smoke Cigarettes And Reek |