| Abbreviation | Definition |
|---|---|
| NLIX | NL Industries |
| NLLX | Northern Line Layers |
| NLLX | Northern Line Layers Incorporated |
| NLPX | Perkins Motor Transport |
| NLPX | Perkins Motor Transport Incorporated |
| NLR | Northern Lines Railway |
| NLSU | Nautilus Leasing Services |
| NLSU | Nautilus Leasing Services Incorporated |
| NLSX | National Starch and Chemical |
| NLSX | National Starch and Chemical Company |
| NLSZ | Trans Ocean Chassis Corporation |
| NLTX | National Starch and Chemical |
| NLTX | National Starch and Chemical Company - Speciality Synthetic Polymers Division |
| NLX | Allied Chemical Canada |
| NMCX | National Machinery |
| NMCX | National Machinery Company |
| NMGR | New Mexico Gateway Railroad |
| NMLX | National Metal Corporation |
| NMLX | National Metal Corporation Limited |
| NMMX | National Machinery Company - Michigan |