28 years later, Buzz wrote a letter to Barry Goldman, a professor at the University of Maryland. (Many thanks to Benjamin Cole.) Transcript September 25, 1997 Dear Mr.Goldman, I am writing to you to share some of my personal ideas and thoughts about my experiences related to the moon landing.

letters make words dating material-10

Mark "A" represents the mark used between 18; mark "B" represents the mark between 18.

After 1884, the diamond-shaped marks were replaced by the letters Rd. (for registered number)—and numbers indicating the year the piece was registered (see Mark "C).

It consists of a set of words written out in a square grid, such that the same words can be read both horizontally and vertically.

The number of words, which is equal to the number of letters in each word, is known as the "order" of the square.

Tables listed here tell how to decode the mark to learn the type of material, month, maker, and year of manufacture.

To obtain more detailed information, contact one of the following offices or visit their websites: Both offices will research designs for a fee. Here are some notes to help date any piece that bears an English registry mark.

It is generally a raised area above the rest of the city where the most important sacred and secular buildings are brought together.

The buildings on the Athenian Acropolis were important for trade and worship.

For example, this is an order 5 square: A popular puzzle dating well into ancient times, the word square is sometimes compared to the magic square, though apart from the fact that both use square grids there is no real connection between the two.

In addition to satisfying the basic properties of word squares, the Sator Square spread widely due to several other attributes: it is palindromic; it can be read as a sentence of obscure meaning; and additional meaning such as reference to the Christian Paternoster prayer can be derived from its letters.

However, the word "Arepo" appears nowhere else in Latin literature; most of those who have studied the Sator Square agree that it is to be taken as a proper name, either an adaptation of a non-Latin word or, more likely, a name invented specifically for this sentence.