Letters are strange. They're the bedrock of the whole written communication system. But when you think about it, they’re really just pictures.

They’re visual elements that can be changed in color, shape and characteristic. For this reason, they are particularly popular when it comes to logo design; just a couple letters can speak a thousand words. But it also makes them very tricky to work with.

Using a combination of typography as a visual component can bring big advantages and challenges, especially when it has to represent an entire brand.

Make your letter-based logos (commonly called lettermarks or ligatures) look too pictorial, and they'll lose their ability to communicate a direct message. But if you just simply put letters together, they’ll fail to make a visual impact on the audience.

Fortunately, we have found this article from Company Folders, which have gathered up some great techniques and tips for creating powerful two-letter logos:

http://www.companyfolders.com/blog/two-letter-logo-design

Hope that was useful!