| Terms for subject Abbreviation (890990 entries) |
| PCI-64 | 64-bit | Bricker |
| 64-bit (Of, pertaining to, or descriptive of the amount of data -64 bits, or 8 bytes- that certain computer systems or programs can process at one time) | 64 bit | |
| 64-QAM | 64-state quadrature amplitude modulation | |
| 64-QAM | 64-state quadrature amplitude modulation | |
| U.S. area phone code Iowa | 641 | |
| 643ASG | 643rd Area Support Group | |
| 643ASG | 643rd Area Support Group | |
| U.S. area phone code Ontario | 647 | |
| U.S. area phone code Turks and Caicos Islands | 649 | |
| phone country code Singapore | 65 | |
| radioactive zinc-diethylenetriamine pentacetate | ||
| U.S. area phone code California - West Bay Area | 650 | |
| U.S. area phone code Minnesota - St. Paul | 651 | |
| U.S. area phone code Montserrat-Carib | 664 | |
| Music | 668 | |
| 669 Composer 8-channel MOD Music File | 669 | |
| 669 Composer 8-channel MOD Music File | 669 | |
| phone country code Saipan | 67 | |
| gallium citrate | ||
| U.S. area phone code CNMI-Mariana Islands | 670 |