212c
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Let's continue. 

  KISS .      KISS EMIT

  . 3                  \ 3
  . ( 3 + 4 * 5 )      \ 35
Nesting is allowed (12 levels deep): 
  . ( 3 + ( 4 * 5 ) )
  . ( ( 3 + 4 ) * 5 )
Mixing with other Forth commands is no problem: 
  . BASE              \ 291976 (at least one Forth)
  . ( BASE @ )        \ 10 (parentheses needed!)

  . ( BASE @ 1+ )     \ 11
  BASE . ( @ 1+ )     \ 11
  BASE @ . 1+         \ 11

  . ( BASE @ + 5 )    \ 15
  BASE . ( @ + 6 )    \ 16
  BASE @ . ( + 7 )    \ 17
Undoubtedly many more variants are possible. 
  . ( 9 + DUP )       \ 18
  . ( 1 20 - SWAP )   \ 19
Incredibly flexible, no doubt, but easier?

Let's explore even further. 

  KISS >      KISS <     KISS =      KISS <>
  KISS IF     KISS THEN
  KISS AND

  : TEST (( x -- )
    CR . DUP ." is "
    IF ( DUP = 0 )  THEN ( ." zero " )
    IF ( DUP < 0 )  THEN ( ." negative " )
    IF ( 0 < over ) THEN ( ." positive " )
    ." and "
    IF   ( = ( 1 AND TUCK ) )
    THEN ( ." odd." ELSE ." even." ) ;

  KISS TEST

  TEST ( 100 - 111 )     \ -11 is negative and odd.