| A.A.M.C. | American Air Mail Catalog |
| A.P.O. | Army Post Office |
| AVE | Average Centering |
| BK or Bklt. | Booklet |
| B.O.B. | Back of Book |
| BL | Bottom Left |
| BR | Bottom Right |
| E.C.V. | Est. Catalog Value |
| F | Fine Centering |
| FDC | First Day Cover |
| F.V. | Face Value |
| G.D.R. | German Democratic Republic |
| Imperf. | Imperforate |
| M | Mint Stamps |
| MH | Mint Hinged |
| MLH | Mint Lightly Hinged |
| MNG | Mint No Gum |
| MNGAI | MNGAI—Mint No Gum as Issued |
| MNH | Mint Never Hinged |
| M/U | Mint and Used Stamps |
| MVLH | Mint Very Lightly Hinged |
| PB | Plate Block |
| P.C.S. | Postal Commemorative Society |
| Perf. | Perforated |
| Pl.# | Plate Number |
| PNC | Plate Number Coil |
| P.R.C | People’s Republic of China |
| P.S.S. | Precancel Stamp Society |
| R.P.O. | Railway Post Office |
| SC | Scott Catalog |
| SF | Space Filler |
| SG | Stanley Gibbons Catalog |
| SP | Souvenir Pages |
| // | Short Set |
| Ty. | Type |
| U or No Designation | Used |
| UL | Upper Left |
| Unwmk. | Unwatermarked |
| U.N. | United Nations |
| U.P.U. | Universal Postal Union |
| UR, UL | Upper Right, Upper Left |
| U.S.P.O.D. | U.S. Post Office Department |
| U.S.P.S. | United States Postal Service |
| UV | Ultraviolet |
| VF | Very Fine Centering |
| W.A. | Water Activated Gum |
| Wmk. | Watermarked |
| W.W. | World Wide |
| WWI | World War I |
| WWII | World War II |
| XF | Extra Fine Centering |
