Okay. Well, I think that can be confusing. When I see or hear spiked head, I'm thinking just from the head not the bust, shoulder or vest. Although you're right, C on C says this:
U.S. Coins with "SPIKE HEAD"
All "SPIKE HEADS" will have a die crack from the rim into any portion of the bust. It shall be limited to die cracks found on the obverse of the coin. The designation SKH will identify this type of die crack.