obverse

Short definition from Wiktionary

Adjective

1. 1
   Turned or facing toward the observer.
2. 2
   Corresponding; complementary.
3. 3
   Having the base, or end next to the attachment, narrower than the top.

Noun

1. 1
   The heads side of a coin, or the side of a medal or badge that has the principal design.
2. 2
   A proposition obtained by obversion, e.g. All men are mortal => No man is immortal.