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2. Free-piston engine - Wikipedia

   en.wikipedia.org/wiki/Free-piston_engine

   Free-piston engine used as a gas generator to drive a turbine. A free-piston engine is a linear, 'crankless' internal combustion engine, in which the piston motion is not controlled by a crankshaft but determined by the interaction of forces from the combustion chamber gases, a rebound device (e.g., a piston in a closed cylinder) and a load device (e.g. a gas compressor or a linear alternator).

3. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   Some geographic area codes are similar to the toll-free codes, e.g., 801, 818, 860. Toll-free numbers are also sometimes confused with 900-numbers, for which the telephone company bills the callers at rates far in excess of long-distance service rates for services such as recorded information or live chat.

4. Hamming code - Wikipedia

   en.wikipedia.org/wiki/Hamming_code

   Hence the rate of Hamming codes is R = k / n = 1 − r / (2 r − 1), which is the highest possible for codes with minimum distance of three (i.e., the minimal number of bit changes needed to go from any code word to any other code word is three) and block length 2 r − 1.

5. ISO 3166-1 alpha-2 - Wikipedia

   en.wikipedia.org/wiki/ISO_3166-1_alpha-2

   The United Nations uses a combination of ISO 3166-1 alpha-2 and alpha-3 codes, along with codes that pre-date the creation of ISO 3166, for international vehicle registration codes, which are codes used to identify the issuing country of a vehicle registration plate; some of these codes are currently indeterminately reserved in ISO 3166-1.

6. Zero-coupon bond - Wikipedia

   en.wikipedia.org/wiki/Zero-coupon_bond

   Zero coupon bonds have a duration equal to the bond's time to maturity, which makes them sensitive to any changes in the interest rates. Investment banks or dealers may separate coupons from the principal of coupon bonds, which is known as the residue, so that different investors may receive the principal and each of the coupon payments.

7. United States Code - Wikipedia

   en.wikipedia.org/wiki/United_States_Code

   A few volumes of the official 2012 edition of the United States Code. The United States Code (formally the Code of Laws of the United States of America) [1] is the official codification of the general and permanent federal statutes of the United States. [2]