| Acronym | Definition |
|---|
| BTBT➣Band-To-Band Tunneling |
| BTBT➣Ballistic Tip Boat Tail (bullets; Nosler) |
| BTBT➣Bro Time Best Time |
| BTBT➣Baccalieu Trail Board of Trade (est. 1997; Newfoundland and Labrador, Canada) |
| BTBT➣Beyond the Burning Time (Kathryn Lasky book) |