The spacing between the baselines of the typeface.
The general term logo signifies all marks that represent a brand.
When designing a logo, one of the most important questions is if you want to design it as a logomark or logotype.
The difference between these two terms is that the logomark is a symbolic icon, a pictorial logo. Some of the most known examples are the Apple shape with the bite mark by Apple and the bluebird from Twitter.
A logotype, often called a wordmark or lettermark, is the logo in letter form. Two well-known examples are Google and Coca-Cola.
A combination logo is a logomark combined with a logomark. The pictorial logo is firmly implemented with the logotype; both elements are necessary to identify the company brand.
An example of a combination logo is the Dove logo.