Answer:
A memorandum (abbrev.: memo; from Latin memorandum est, "It must be remembered") is a written message that may be used in a business office. ... In business, a memo is typically used by firms for internal communication, while letters are typically for external communication
A memo sample is an individual material sample used to confirm the designer's or consumer's initial material selection. Designers also use memo samples to present material recommendations to their clients. ... Memo swatches are generally larger than catalog samples, such as swatch cards, stack books or swatch decks
