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2. Check mark - Wikipedia

   en.wikipedia.org/wiki/Check_mark

   The check or check mark (American English), checkmark (Philippine English), tickmark (Indian English) or tick (Australian, New Zealand and British English) is a mark ( , , etc.) used in many countries, including the English-speaking world, to indicate the concept "yes" (e.g. "yes; this has been verified", "yes; that is the correct answer", "yes ...

3. Check valve - Wikipedia

   en.wikipedia.org/wiki/Check_valve

   Tilting-disc inconel check valve Check valve symbol on piping and instrumentation diagrams.The arrow shows the flow direction. Vertical lift check valve. A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.

4. Check digit - Wikipedia

   en.wikipedia.org/wiki/Check_digit

   Using different weights on neighboring numbers means that most transpositions change the check digit; however, because all weights differ by an even number, this does not catch transpositions of two digits that differ by 5 (0 and 5, 1 and 6, 2 and 7, 3 and 8, 4 and 9), since the 2 and 5 multiply to yield 10.

5. Aircraft maintenance checks - Wikipedia

   en.wikipedia.org/wiki/Aircraft_maintenance_checks

   Some authorities use a type of check, known as a 3C check or Intermediate Layover (IL), which typically includes light structural maintenance, including checks for corrosion, or on specific high-load parts of the airframe. [7] The 3C check may also be used as the opportunity for cabin upgrades, e.g. new seats, entertainment systems, carpeting.

6. Check (chess) - Wikipedia

   en.wikipedia.org/wiki/Check_(chess)

   Check (chess) Black 's king is in check by the white rook. In chess and similar games, check is a condition that occurs when a player's king is under threat of capture on the opponent's next turn. A king so threatened is said to be in check. A player must get out of check if possible by moving the king to an unattacked square, interposing a ...

7. Check (pattern) - Wikipedia

   en.wikipedia.org/wiki/Check_(pattern)

   Check (also checker, Brit: chequer, or dicing) is a pattern of modified stripes consisting of crossed horizontal and vertical lines which form squares.The pattern typically contains two colours where a single checker (that is a single square within the check pattern) is surrounded on all four sides by a checker of a different colour.