The lightning bolt is a common satanic symbol, and is also sometimes represented as a letter Z. In the Bible, Satan fell to Earth as a bolt of lightning. I suppose a knife through a "Z" could be a declaration of war against the satanic cabal.
Trust the Plan :)
"We the People of the United States, in Order to form a more perfect Union, establish Justice, ensure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.