| Abbreviation | Definition |
|---|---|
| NIAID | Never Inhale An Infectious Disease |
| NIB | Naughty Ignorant Boy |
| NIB | Naughty Indian Boy |
| NIB | Necrophilics In Black |
| NIB | Nothing In Brain |
| NIBS | Not Invented in Britain Syndrome |
| NIC | Nothing Is Complicated |
| NICE | Naughty Individual Creating Evil |
| NICE | Never Include County England |
| NICK | Never Install Ceiling Kites |
| NIH | National Institute of Humans |
| NIH | Nicotine Inbred Haters |
| NIKE | NASA Named Missile |
| NIKE | National Indian Knitting Enterprise |
| NIKE | Necessitates Indonesian Kids Employment |
| NIKE | Need Interested Kissing Expert |
| NIKE | Neutralizing Is Kinda Easy |
| NIKE | Never Initiate Keep Evolving |
| NIKE | Newly Invented Killing Express |
| NIKE | No Islamic Kingdom on Earth |