The UK has its iconic blue plaques, in Warsaw we have hugely symbolic Tchorek plaques made out of sandstone to commemorate battles and executions from the war. There's obviously lots more of memorials in different shapes and sizes, but recently we've started installing a lot of historical plaques with basic information about significant streets or buildings made of glass, which I find very elegant and modern. I like how unified and aesthetic they are.
Do your countries/cities have unified commemorative plaque designs? Or do you have any which stand out particularly?