My logo system consists of several variations. The primary logo is TOVARKOV wordmark which I’m using most of the time. Also, there is an alternative secondary logo version icon + wordmark. And finally, in some cases I’m using just the icon alone like favicon of this website.
Clear space is the area around logo where no visual elements are allowed. Often the size of this clear space is drawn from some element of a logo. In my logo it’s letter V which is the same height of all letters in the logo except for O which is a tiny bit higher for optical balance.