Updated: Jun 1, 2019
Logos separating into four categories:
Wordmarks are freestanding word or multi-letter abbreviation groupings comprising a logo, a.k.a. logotypes. Companies with wordmark logos include eBay, IBM, CNN, Google, Kleenex, Saks Fifth Avenue.
Letterform logos are comprised of a single letter. Think Honda, Uber, Unilever, Beats and McDonald’s.
Pictorial logos are illustrated symbols of recognizable things. Starbucks, Twitter and Playboy all have pictorial logos.
Abstract logos don’t represent anything otherwise recognizable, like abstract art. Perhaps the most famous brand to successfully pull off an abstract logo is Nike.
Thanks to www.entrepreneur.com for the information provided.