Comment Possible meaning (Score 1) 486
Students graduating from the University of Waterloo's Math Faculty are invited to make one or more graduating pledges to support U(W). One of those pledges is the Dean's Prime Number Club, which confers upon you your very own Prime Number.
As others have noted, the binary sequence is a palindrome prime number in base 2. David Johnston is U(W)'s out-going President. It's likely that the Math Dean's Office has awarded him his very own Prime Number as an honorific (or for completing the pledge!) and he has chosen to incorporate it into his personal Coat of Arms.
I am unable to find the Prime Number registry online or in fact any mention of it at all, U(W) web pages about pledges aside. Digging out my old papers I see that the letter awarding one's Prime Number merely says "Here it is in the box at the bottom. Congratulations!" Perhaps the Dean's Office will confirm tomorrow.
...Stu, hopefully not the only member of the Dean's Prime Number Club reading Slashdot...