(a) BC : The letters BC means Before Christ. Dates are generally counted (i.e. the day, the month and the years) or assigned to the birth of Jesus Christ, the founder of Christianity so 2000 BC means 2000 years before the birth of Jesus Christ. All dates before the birth of Jesus Christ are counted backwards and generally have the letter BC (Before Christ) added on.
(b) AD : We sometimes find AD before dates. This stands for two Latin words, “Anno Domini”, and mean in the year of the lord (i.e., Jesus Christ). For example, 2008 can also be written as AD 2008 or 2008 AD.
(c) CE : Sometimes CE is used instead of AD. The letters CE stands for ‘Common Era’.
(d) BCE : Sometimes BCE is used instead of BC. The letters BCE stands for ‘Before Common Era’. We use these terms because the Christian Era is now used in the most countries of the world.
(e) Script : Way of style of writing of a language is called a script. It consists of letters or signs. For example, ‘Devnagri’ is a script of Hindi.