I got this excerpt from Wikipedia, which I do NOT think of as the be all end all gospel. Merely one of many information sources that should be taken with the appropriate grain of salt. The Satanic Bible ends with a mysterious stamp reading only "YANKEE ROSE", in all capital letters, and in slightly inkier typing. The meaning of this is a matter of speculation, and remains a mystery, to both the public and Satanists alike. The Church of Satan website, however, offers one possible clue in the song by that name, recorded by LaVey on his record Satan Takes a Holiday. However, the website also adds that this may or may not be a clue at all. LaVey wished its meaning to remain secret, and the true significance of "Yankee Rose" shall forever remain a mystery. David Lee Roth's song "Yankee Rose" came out around the time of the "Satanic Panic" hysteria of the 1980s, a time when many rock bands were falsely accused of practicing or promoting devil worship, or including subliminal messages on their albums. And the fact that the phrase "Yankee Rose" shows up in The Satanic Bible didn't help Roth in this regard. However, again, the use of the same words here is purely coincidental.

This is what it says on www.churchofsatan.com "There are many speculations regarding why Anton LaVey chose these enigmatic words to conclude The Satanic Bible. However, Dr. LaVey wanted their significance to remain a mystery and we respect his wishes. He did record the song by that name on his album “Satan Takes a Holiday,” which was released by Amarillo Records and which has been re-released by Reptilian Records on their Adversary label. Some say this jaunty tune was one LaVey used to end his sets when playing organ in bars and nightclubs, but who can be certain that this is a clue?"