Decoration (noun). specifically, any mark of honor to be worn upon the person, as a medal, cross, or ribbon of an order of knighthood, bestowed for services in war, great achievements in literature, art, etc. Origin: [LL. decoratio: cf.
A P-N junction (or N-P junction) is formed by creating two substrate materials of P type and N type on a semiconductor. P type means it is doped with free holes (electron depletion) and the N type is doped with electrons. Of course by physics, the free holes and free electrons would like to neutralize each other.
Postscript - A postscript (PS or P.S.) is writing added after the main body of a letter or other body of writing. The term comes from the Latin post scriptum, an expression meaning written after (which may be interpreted in the sense of that which comes after the writing).