| Abbreviation | Definition |
|---|---|
| MA | Suitable for Mature Audiences only |
| MAGI | Mature Adult Group Involvement |
| MFC | Mature Fan Club |
| MGM | Metro Goldwyn Mayer |
| MGP | Movie Gallery Post |
| MLT | Making Love Tape |
| MO | Mildly Overrated |
| MR | Mature Readers |
| MRS | Movie Recommendation System |
| NBSP | Non Breaking Space Paws |
| NC | No Children |
| NC-17 | No Children under 17 |
| NFB | National Film Board |
| NM | No Movie |
| NR | Not Rated |
| NTSC | National Television System Committee |
| NVF | Non-Violent Film |
| NVY | Not Viewed Yet |
| NYR | Not Yet Released |
| OC | Overated Crap |