On the other side of the shield is Prince Harry's coat of arms.
Several golden poppies, California's state flower, and wintersweet, which grows at Kensington Palace, appear in the grass below the shield.
The shield's blue background represents the Pacific Ocean off the California coast. There is a distinct crown at the top, and it is complemented by a lion and a white dove, both wearing matching crowns themselves.
The three quills represent communication and the power of words and could even allude to her outspoken nature on a number of issues she's passionate about such as feminism.
It is understood since Kate's siblings and parents are British citizens they entitled to use the Middleton Coat of Arms, while Meghan's American heritage means the same honour has not been bestowed on her family, according to royal tradition.
The coat of arms created for the Duke and Duchess of Sussex.
Meghan is now the Duchess of Sussex
"The Duchess of Sussex took a great interest in the design", Mr. Thomas Woodcock, Garter King of Arms said in a short statement. The supporter representing Markle is a songbird with wings elevated as if in flight and an open beak, which further represents communication.
The Coat of Arms also features traditional elements.
Meghan has also been assigned her own Coronet composed of two crosses patée, four fleurs-de-lys and two strawberry leaves.
The left half of the shield features the quartered British Royal Arms.
Meghan and Harry married at St. George's Chapel at Windsor Castle on May 19.
He said: "There was no Coat of Arms from Meghan's side of the family so it had to be drawn up". Organisations can also be granted a coat of arms.