Pointon - is it a "pun"?

It is hard to imagine how the blazon "Ermine, on a fess Sable three crosses pattee Or" could provide a pun on the surname Pointon.

Perhaps this one has been staring me in the face for years, perhaps it was never meant to be a pun, perhaps it was and I just missed it but I've just reached the surnames beginning with "P" in the Vale Royal section of the website revamp and the arms of Pointon and now, after all these years, I realize that it may indeed be a pun.

When I first emblazoned these arms, many years ago, I had to concentrate to see the crosses pattee and always felt that the emblazonment presented me with an optical illusion which prevented me from seeing the crosses; it dawns on me now that the optical illusion presents me with double ended arrows; could these be pointing - or pointon!