Like most companies, motorcycle manufacturers have developed iconic logos over the years. To observers, though, it's rarely just the sight of the Bar and Shield or the triple tuning forks that tells you that something is a Harley or a Yamaha.
No, one of the biggest giveaways is undoubtedly the colors. Harley-Davidson's very specific shade of orange and black is different from, say, KTM's shade of orange. Plenty of OEMs use one shade of blue or another, but Team Yamaha Blue still stands out from the crowd as its own thing.