I use "Principal, VA "on mine, as: 1) I like the word "principal," even though technically I am an LLC rather than a partnership. But "prinipal" describes me as a solely owned business, 2) I think it is important to show ownership on the business card, as that may imply a higher degree of dedication and permanence to my services, 3) In my case, "virtual assistance" is spelled out elsewhere on the card; so I indicate "VA." But again, I want "VA" in the title as well, to indicate that I -- the owner -- am delivering the service. I think that adds value.