What is the meaning of 6 threescore and 6?

The phrase "6 threescore and 6" refers to a specific numerical value. A "score" is equal to 20, so "threescore" means 60 (3 x 20). Therefore, "6 threescore" amounts to 360 (6 x 60), and adding 6 gives a total of 366. This phrase is often associated with biblical references, particularly the number 666, which is known as the "number of the beast" in the Book of Revelation.