Monograms vs. Initials

These two terms, Monograms and  Initials, are often times used interchangeably...and incorrectly!
A Monogram is a design typically using three alphabetic letters combined or interlaced of one's initials, with the center letter delineating the LAST NAME and being sized larger the the side letters.
Initials is a design typically using three alphabetic letters of one's initials.  The letters are placed in the same order as the name and are in the same size.