| Abbreviation | Definition |
|---|---|
| BLA | Siksika |
| BMT | Beaumont, CA |
| BNT | Bantu (Other) |
| BOD | Tibetan |
| BQB | GABUSA: a language of Indonesia (Irian jaya) |
| BRA | Braj |
| BRE | Breton |
| BRT | British |
| BSH | KATI: a language of Afghanistan |
| BUA | Buryat |
| BUG | Buginese |
| BUL | Bulgarian |
| BUR | Burmese |
| BYQ | BASAY: An Extinct Language of Taiwan |
| BYR | Baruya |
| CAD | Caddo |
| CAI | Central American Indian (Other) |
| CAM | Central America |
| CAR | Carib |
| CAR | Caribbean |