Logos play an important role in brand communication. Having a designer alphabet gives a distinct image to the text logos and makes the brand easily recognizable with just a single letter.
See how the brands Axis Bank, Arvind mills, Reliance (ADAG) and Areva created their own alphabet A in their logos.
More brands, logos and alphabets to follow later.
As these Brands have been in long years in the market, So it is easily to create logo with Alphabets, For New contender its hard to create such impact.