Such as M.d., RN, LSW....
I'm looking for the word that fills the blank in following sentence:
It is as if living with her for as long as he did merits the addition of a ________ to his signatory.
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The term is post-nominal letters. It is also referred to as post-nominal abbreviations, or post-nominal titles. In your sentence, I would probably use post-nominal title.
You could use the term credentials in your sentence.
It is as if living with her for as long as he did merits the addition of credentials to his signatory.
The Free Dictionary defines credentials as:
Evidence or testimonials concerning one's right to credit, confidence, or authority
A letter or certificate giving evidence of the bearer's identity or competence
Anything that provides the basis for confidence, belief, etc., or for extending credit