The Avent Coat of Arms
British genealogist Peter W. Coldham wrote, in his paper "The Avant-Avent Family of England":
"None of the standard heraldic works of reference give a coat of arms for the Avents, but it is certain that the family used one with which to seal documents. We discovered in the Plymouth archives a manuscript volume on the history of the parish of Brixton, Devon, written by Richard Lane in 1833 which contains much Avent information, including a copy of a deed signed by John Avent of Plymouth in 1765 and sealed by him with his coat of arms."
Unfortunately, Mr. Coldham did not include a drawing of this coat of arms in his paper.
Some say that this is the Avent coat of arms, though the webmaster has seen other coats of arms, also supposedly of the Avent family, that look totally different.
The design for this one came from a grave in the parish church at Plympton, St. Mary, Devon, England, where the American Avents most likely originate, so it's a possibility.
Here's another one, so take your pick: