Before Present (BP) years is a time scale used in archaeology, geology, and other scientific disciplines to specify when events in the past occurred. Because the "present" time changes, standard practice is to use 1 January 1950 AD as the origin of the age scale, reflecting the fact that radiocarbon dating became practicable in the 1950s. The abbreviation "BP" has also been interpreted to mean Before Physics.

The BP scale is sometimes used for dates established by means other than radiocarbon dating, such as stratigraphy.

This usage differs with the recommendation by van der Plicht & Hogg, followed by the Quaternary Science Reviews, both of which requested that publications should use the unit "a" [for year] and reserve the term "BP" for radiocarbon estimations.

Beginning in 1954, metrologists established 1950 as the origin year for the BP scale for use with radiocarbon dating, using a 1950-based reference sample of oxalic acid:

The problem was tackled by the international radiocarbon community in the late 1950s, in cooperation with the U.S. National Bureau of Standards. A large quantity of contemporary oxalic acid dihydrate was prepared as NBS Standard Reference Material (SRM) 4990B. Its ¹⁴C concentration was about 5% above what was believed to be the natural level, so the standard for radiocarbon dating was defined as 0.95 times the ¹⁴C concentration of this material, adjusted to a ¹³C reference value of –19 per mil (PDB). This value is defined as "modern carbon" referenced to AD 1950. Radiocarbon measurements are compared to this modern carbon value, and expressed as "fraction of modern" (fM). "Radiocarbon ages" are calculated from fM using the exponential decay relation and the "Libby half-life" 5568 a. The ages are expressed in years before present (BP) where "present" is defined as AD 1950.

Mickie Laree James (born August 31, 1979), is an American professional wrestler and singer of mixed Native American-Caucasian descent, currently signed to Total Nonstop Action Wrestling (TNA), where she is a former two-time TNA Women's Knockout Champion.

James began her professional wrestling career in 1999 as a valet on the independent circuit, where she was known under the name Alexis Laree. She trained in several camps to improve her wrestling abilities before working for Total Nonstop Action Wrestling in June 2002, where she gained national attention. After only a few appearances, she joined a stable called The Gathering and was written into storylines with the group. She is also the only woman to be involved in Clockwork Orange House of Fun matches.

James appeared in WWE in October 2005 and was placed in a storyline with Trish Stratus, in which James' gimmick was that of Stratus' biggest fan turned obsessed stalker, an angle which lasted almost a year. She received a push, and she won her first WWE Women's Championship at WrestleMania 22, a title she has held a total of five times. James also won her first Divas Championship at Night of Champions in 2009 to become the second Diva to hold both the Women's and Divas titles. She, however, was released from the company on April 22, 2010, after which she returned to Total Nonstop Action Wrestling. Between WWE and TNA, James is an eight-time champion, and is also the only female to hold the WWE Women's, WWE Divas and TNA Knockout Championships in wrestling history.