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A monogram is a motif made by overlapping or combining two or more letters or other graphemes to form one symbol. Monograms are often made by combining the initials of an individual or a company, used as recognizable symbols or logos. A series of uncombined initials is properly referred to as a cypher (e.g. a royal cypher) and is not a monogram.

(via wikipedia/ the source of ALL knowledge)

Heres some super snazzy monograms to get your design day flowing:

James Edmondson

André Beato

MR. MULE's TYPOGRAPHIC SHOWROOM AND EMPORIUM

Bilde

alex trochut

Wilkinson

R&Co. Design

Kossyo

Get Corporate, yo!

Monograms are often used as logo types.

here's a link to some pretty schweet ones:

http://dzineblog.com/2010/10/30-best-monogram-logo-designs-for-your-inspiration.html