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" Leave-Behind

Definition: A premium left with prospective customers by a sales person, to remind them of the product or service being sold."

http://marketing.about.com/library/glossary/Marketing_Terms/...

Desculpe utilizar este estratagema, mas o suporte explicativo que quero fornecer não cabe no espaço reservado a um comentário:

«Don't leave home without plenty of business cards and brochures for the event's display tables. This is where vendors leave their product information and also a place where they can find yours. Another option is to create leave-behinds for face-to-face meetings with clients. These are booklets or file folders that you leave with your client after your meeting. It makes it easy for your clients to locate you when they have a writing project to assign. Check for bargains and ideas in the back-to-school sections at department stores, or stock up on deals from office and art supply stores. Include items like business cards, resume, reference letters, testimonials, and your best writing samples. Make sure they have a professional appearance and you'll create an impressive reminder.»

Num tom mais coloquial, esta expressão quer dizer exactamente que se deixou algo por tratar ou fazer... :)