I'm unfamiliar with any specific or unique meaning of 420 in a mathematical context, but in the popular culture these days, 420 refers to marijuana usage.
Pi as a letter in the greek alphabet that was used from early 8th century BC. If you are refering to the mathematical constant pi it was known even earlier than 20th century BC. If you want to connect these two as in usage of pi as the symbol for the mathematical constant then that was done in the early 1700s and made popular by Euler in the mid 1700s. Pie as a word is first found in the 12th century english, and I think that the pastry itself has some longer history, but I doubt it goes earlier than the 8th century BC.
A score is 20. For popular example in Abraham Lincoln's speech (The Gettysburg Address) He uses the words "Four score and seven years ago our fathers brought forth...." and so on he is clearly saying 87 years due to the Declaration of Independence which happened 87 years earlier.
chloe is popular not the most popular but the most popular is rachel cause im called rachel its so cool that name i heart me
The most 'popular' number in the world has not been recorded.
MC Escher, Dutch artist.
M. C. Escher
MC Escher, Dutch artist.
Escher
He was MC Escher.
MC Escher.
Apple Macintosh
checks and balances, and popular sovereignty
MC Escher
The basic principles of federalism can be found in the U.S. Constitution. These principles include popular sovereignty, separation of powers, limited government, a checks and balances system, and judicial review.
The first web browser, WorldWideWeb, was graphical. ViolaWWW was the first one to achieve any popularity, released a year later in 1992. A year after that, NCSA Mosaic was released, and became even more popular.
There were six basic principles that the constitution was built on. Popular sovereignty, limited government, checks and balances, separation of powers, judicial review, and federalism were the principles used.