A comb is a tool, either bristled or toothed, used for straightening one's hair. They can either have multiple rows of teeth or bristles, or they can be flat and can be easily carried about in one's pocket.
Pocket combs[]
Combs are considered a handy pocket item, as men can often find themselves in situations when they may benefit from quickly touching up one's hair, such as when a potential suitor appears on the scene, or right before an important meeting, or in other situations when presentability would be important.