1. Bacillus thuringiensis: This is the most common meaning of "Bt". Bt is a type of bacteria that produces toxins that are harmful to certain insects. It is commonly used as a biological insecticide.
2. British Thermal Unit: This unit measures the amount of heat energy required to raise the temperature of one pound of water by one degree Fahrenheit. It's often used in the context of heating and cooling systems.
3. Boot: This meaning is less common but can be used in the context of footwear, particularly in older or informal language.
4. Business Transaction: This meaning can be used in the context of finance or business dealings.
5. Other specific uses: "Bt" can also be a specific abbreviation for different things depending on the field or industry. For example, in some scientific fields, "Bt" might refer to a specific type of protein or molecule.
To understand the meaning of "Bt" in a specific context, you need to consider the surrounding words and the topic being discussed.