The phrase "a placard of" is correct and usable in written English.
It can be used when referring to a sign or notice that conveys information, typically displayed in a public space.
Example: "The protestors held a placard of their demands, urging the government to take action."
Alternatives: "a sign of" or "a notice of".
A placard of one of the organizing groups goes by — the British Association of Muslims.
I sat in the building lobby with a placard of Hillary.
My favourite ever anti-homophobia placard is the one reading "Corduroy skirts are a sin" held adjacent to a sartorially misguided evangelist with a placard of her own.
In his home, a concrete husk with a tented roof, he hangs a placard of Mr. Barzani's late father, Mullah Mustafa Barzani, a famous Kurdish military and political leader.
"Fraidy cat! Fraidy cat! Who's afraid of the highest court in the land?" a group of Bush supporters shouted when a Gore supporter held up a placard of the five justices -- in clown makeup -- who on Saturday afternoon ordered a halt to the recount in Florida.
So we've made a placard out of cardboard boxes from Lidl, and we stand outside the Fringe office shouting, "Stone Age to Space Age".
Yet on Thursday, she found herself at a noisy demonstration in Times Square, within view and earshot of the Dominican consulate, holding a placard critical of the Dominican government.
Today, Manzi was alone in the five-acre lot wearing a yellow rain slicker while holding an umbrella and standing next to a placard critical of Burk's cause.
She carried a placard "Parents of Gays Unite in Support for Our Children".
"Friends don't let friends vote Democrat," chanted one salesman, pushing a display placard of campaign buttons.
In front of each dish sat a placard informing athletes of vital nutritional information like serving size, calorie content and grams of fats and carbohydrates.
