The # sign is missing - every state has a notary commission, and some notary persons add their commission number to their documents; it lends more authenticity to their signature. If it is required to add that info, it varies by state.

An example of a NY Notary signature:

TERESA WEBB DOANE
MY COMMISSION #DD 276733
Expires: December 27, 2007
Bonded Thru Notary Public Underwriters



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Note added at 43 mins (2008-09-04 08:14:08 GMT)
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I believe it is part of the commission number, not a designation, as in NYS, there are not any separate licenses, or differentiation of types of notary.

In the URL reference, §131. Procedure of appointment; fees and commissions, the term "duly dated" is frequently noted, but it doesn't make sense in this context.

If it is important to have an absolute answer, and no other ProZ members have the answer before 8:30am EDT, I will make a simple phone call to the commission to ask for you, then enter the information at that time.

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Note added at 44 mins (2008-09-04 08:15:04 GMT)
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This reference, sorry:

http://www.dos.state.ny.us/lcns/lawbooks/notary.html

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Note added at 50 mins (2008-09-04 08:20:32 GMT)
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OK. That will be in about 5 1/2 to 6 hours - when they open. Also, when other members come online they may have the answer - I will follow through in any event, as promised.

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Note added at 6 hrs (2008-09-04 14:01:50 GMT)
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The commission number on your document is a Florida state registered notary number.

The Florida license rep told me that *DD* is simply part of the number system, followed by 5 digits. Years ago, the commission numbers began with AA, then BB and so forth, and now, for many years, the State of FL notary commission numbers begin with DD.

I discovered this after calling NY (info below) and then
I called the notary underwriter's insurance company, and the representative immediately said "that's a Florida commission number if it starts with DD".

New York commission license numbers begin with 01 (non-attorney) or 02 (attorney), then the first 2 letters of the last name, then a 7 digit number; that has always been the system for NY.

So the answer is that it is does not represent words or anything besides being part of the Florida's notary licensing commission number assignment method.