Numbering System
Most signs are identified by a unique series of letters and numbers. The letters refer to the type of sign. The numbers refer to the size of the sign or the number of the sign within a specific sign series. For example, a 24-inch STOP sign is designated R1-1-24; a one-line forest road destination with 4” letters is designated FRD-1-4. Here are some common sign abbreviations:
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| BM | Barricade Marker |
| CRS | Composite Recreation Symbol |
| FE | Forest Entrance |
| FL | Forest Leaving |
| FP | Fire Prevention |
| FR | Federal Recreation Symbol |
| FRD | Forest Road Destination |
| M | Route Markers |
| MFE | Minor Forest Entrance |
| MFL | Minor Forest Leaving |
| NRA | National Recreation Area |
| NST | National Scenic Trail |
| P | Poster |
| R | Regulatory (MUTCD signs for roads) |
| RG | Recreational Symbol, General |
| RSE | Recreation Site Entrance |
| RSI | Recreation Site Identification |
| S | Forest Service Shield |
| SA | Site Approach |
| SBL | Scenic Byway Logo |
| SBR | Smokey Bear Fire Rating |
| TD | Trail Destination |
| W | Warning (MUTCD signs for roads) |
| WP | Wilderness/Primitive Area |
| WSR | Wild & Scenic River |
