The generic cannon symbol from the video game Europa Universalis IV
The image itself wasn't too much to go off of, so I looked into the game a bit, and it seems like this gun is meant to originate from around the very end of the middle ages in the late 1400s. That gave me some idea of what to look for, but I wanted to see if I could find anything with more detail went to see if there was one from another angle and found a screenshot of the game on steam with this 3d render which was super helpful.
From the image you have alone, it kind of looks like there's a greenish tint to the gun, so I was debating whether is was wrought/forged iron (both are essentially the same thing at this point in history) or really oxidized cast bronze (these materials being what we see most artillery in Europe being made out of at this point in time). I don't know why you'd choose to have a symbol for artillery be really oxidized, but could be an aesthetic choice I guess lol. But based on the 3d model, it looks like it's definitely iron.
It's definitely mounted on a field carriage, specifically a double-bracket carriage, which means the trail (the part of the carriage on the back that rests on the ground) has those two brackets instead of one in the middle, which we start seeing with the invention of the block-trail carriage in 1775.
Calibre is particularly tough to take a stab at here because I'm not as familiar with artillery from this time period as I am with stuff later on, and to my knowledge the French were actually the first to standardize calibre in the early to mid 1500s. That said, because that system is the closest thing I know of that I can guess off of, I'd guess that it's a culverin, which fires a 17 pound 5 ounce shot.
Final ID: forged iron culverin mounted on a wooden double-bracket field carriage.
