Obverse and reverse

In logic (and usually without being paired with "reverse"), "obverse" has a meaning close to contrapositive.

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The terms obverse and reverse apply almost exclusively to currency, and most often specifically to coins; they are usually described with less precision as, respectively, the front and back sides, or with regard to a coin tossed to produce a random choice between two things, "heads" and "tails". They can also describe the front and back of a Flag (see Flag terminology).

Related Topics:
Coin toss - Flag - Flag terminology

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