Visual or not, there are lots of factors that define a brand. And within the visual ones, logo is probably the most important element.
It can be a logotype, a symbol or a combination where none is better than other & can define too many things like strength, sincerity, quality, speed, etc.
If you're looking for inspiration to create an awesome logo, here is a collection of 20+ frequently updated websites that present beautiful logos around the world which will definitely help you:
LogoPond
Logo Faves
LogoHeroes>
