http://www.yourdictionary.com/logotype
1.a single type body or matrix containing a short, often-used set of letters, or word, as an, qu

http://www.thefreedictionary.com/logotype
1. Printing A single piece of type bearing two or more usually separate elements

http://www.merriam-webster.com/dictionary/logotype
1 : a single piece of type or a single plate faced with a term (as the name of a newspaper or a trademark)

http://encarta.msn.com/dictionary_1861699402/logotype.html
1. type with different characters: a single piece of type that has different unconnected characters on it