Final answer:
ABCP is not relevant to historical dating methods, but BCE (Before Common Era), CE (Common Era), and BP (Before Present) are important abbreviations used for marking dates.
Step-by-step explanation:
ABCP does not appear to be relevant to the information provided. Instead, I can inform you about other abbreviations that relate to dating historical events. BCE stands for Before Common Era and coincides with BC, which means Before Christ. CE stands for Common Era and is equivalent to AD, Anno Domini, which is Latin for 'In the year of our Lord'. Lastly, BP stands for Before Present and is used primarily by archaeologists in conjunction with radiocarbon dating to determine the age of organic materials by measuring radioactive decay.