A date given as BP is a date before 1950. BC means before Christ (although nowadays BCE is used, meaning before the Common Era). CE (Common Era) is used instead of the old term AD, meaning Anno Domini, or after the birth of Christ.

What does BP stand for in carbon dating?

Before Present Before Present (BP) years, or years before present is a time scale used mainly in archaeology, geology, and other scientific disciplines to specify when events occurred before the origin of practical radiocarbon dating in the 1950s.

What is a BP date?

BP and bp. The initials BP stand for years before present. The use of BP by archaeologists, geologists, and other scientists, refers to radiocarbon ages and results from other radiometric dating techniques. Therefore a date like 3000 BP means 3000 before 1950 AD: in other words 1050 BC.

What does Cal year BP mean?

The cal prefix indicates that the dates are the result of radiocarbon calibration using tree ring data. These values should correspond exactly to normal historical years BC and AD. The term cal BP means the number of years before 1950 and can be directly compared to calendar years.

What does BP mean in bullets?

At about the same time, tool steel was adopted for a normal velocity 7.62×39 bullet. Called BP, this bullet was developed in the 1980s and 1990s. It was officially adopted for Russian service in 2002 under the service name 7.62 BP, and with the GRAU designation 7N23.