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The "nine dots" puzzle. The puzzle asks to link all nine dots using four straight lines or fewer, without lifting the pen. The nine dots puzzle is a mathematical puzzle whose task is to connect nine squarely arranged points with a pen by four (or fewer) straight lines without lifting the pen. The puzzle has appeared under various other names ...
Slitherlink is played on a rectangular lattice of dots. Some of the squares formed by the dots have numbers inside them. The objective is to connect horizontally and vertically adjacent dots so that the lines form a simple loop with no loose ends. In addition, the number inside a square represents how many of its four sides are segments in the ...
A paper fortune teller may be constructed by the steps shown in the illustration below: [1] [2] The corners of a sheet of paper are folded up to meet the opposite sides and (if the paper is not already square) the top is cut off, making a square sheet with diagonal creases.
Strikethrough, or strikeout, is a typographical presentation of words with a horizontal line through their center, resulting in text like this, sometimes an X or a forward slash is typed over the top instead of using a horizontal line. [1] Strike-through was used in medieval manuscripts. Contrary to censored or sanitized (redacted) texts, the ...
In the rail fence cipher, the plaintext is written downwards diagonally on successive "rails" of an imaginary fence, then moving up when the bottom rail is reached, down again when the top rail is reached, and so on until the whole plaintext is written out. The ciphertext is then read off in rows. For example, to encrypt the message 'WE ARE ...
X mark. An X mark (also known as an ex mark or a cross mark or simply an X or ex or a cross) is used to indicate the concept of negation (for example "no, this has not been verified", "no, that is not the correct answer" or "no, I do not agree") as well as an indicator (for example, in election ballot papers or in maps as an x-marks-the-spot).
Boggle Flash. An electronic version of Boggle, but consists of five tiles in which one to ten players make words by swapping tiles. This product is sold in the United States under the name Scrabble Flash. Foggle, where the 16 dice have to be used to form valid mathematical equations.
In the US, paper density is usually measured in "pound per reams " (of 500 sheets). Typical Letter paper has a basis weight of paper of 20 or 24 pounds (9.1 or 10.9 kg) – the weight of 500 sheets (a ream) of 17-by-22-inch (431.8 by 558.8 mm) paper at 70 °F (21 °C) and at 50% humidity. [3] One ream of 20-pound Letter-sized paper weighs 5 ...