A combination mark pairs a symbol or icon with the business's wordmark, either locked together or designed to be used separately depending on context.
This is the most common — and often the most practical — structure for new or growing businesses, because it builds icon recognition over time while keeping the name clearly visible for as long as it's needed. Once the icon has earned enough recognition on its own, the business can start using it independently, the way many established brands eventually do.
The main design challenge is making sure both parts work well separately, not just when locked together, since real-world use often calls for one or the other depending on the space available.