Monogram (noun)

1. A design composed of one or more letters, typically a person's initials, used as an identifying mark.
2. An embroidered design of one or more letters, typically a person's initials, used to personalize clothing or other items.

Origin:

From the greek word "monos" meaning "single" and "gramma" meaning "letter".

Examples:

1. The monogram on the handkerchief is her initials.
2. A monogrammed shirt is a shirt with a person's initials embroidered on it.
3. Many luxury brands use monograms as a part of their branding.
4. The monogram on the bag is a combination of her first and last name initial.
5. The monogram on the ring is a combination of both his and her initials.