When I placed my last cache a few days ago (Yo, Bannana Boy!, GCWH3F), which was another of my series of palindrome named caches I promised that the next cache I placed would not be so named. I am irritated at myself when I make promises because then I have to keep them. So here goes.
A semordinlap (coincidently, I'm sure, palindromes spelled backward) is a word that when spelled backward spells another word. Semordinlap is an exemplar of a semordinalp.
Here are a few more examples: diaper, desserts, no, deliver, swap, looter, rewarder, and stressed.
You'll be looking for a small black cylinder to which a magnet has been glued.
I suggest that you take some time for a tranquil stroll through this pleasant cemetery.