| Acronym | Meaning |
| FX | Firefox -Metropolitan France (ISO 3166 Digram; Obsolete 1997) |
| US | United States (alsoISO 3166 And FIPS 10-4 Country Code Digram) |
| YC | Yoctocoulomb |
| SECAM | S?quentiel Couleur ? M?moire (French For Colour Sequential With Memory; TV Standard |
| XO | ???†‡?…??? ????‰???? (Xristianos Orthodoksos |
| WIMP | Weakly Interacting Massive Particle - Windows |
| B?C | Blue ?yster Cult |
| RH | Southern Rhodesia (ISO 3166 Digram; Obsolete 1980) |
| TMR | Twin Main Rotors (helicopter Type) |
| SMIL | Sadomasochisterne I Landet (Danish SM Organisation) |