Christmas
This sign has several variations.
CHRISTMAS:
Hint: Think of a wreath.
CHRISTMAS:
Hint: Think of showing the inside edge of a wreath.
CHRISTMAS:
Hint: Think of showing an initialized form of the sign "TREE." (No, this sign doesn't mean "Christmas Tree." To indicate a Christmas tree, sign CHRISTMAS + TREE.)
MERRY CHRISTMAS!
For the "Merry Christmas" greeting, just show an "M" and a "C"