A novelty is a small manufactured adornment, especially a personal adornment. In this sense, the word is usually used in the plural, novelties. The word is also used to denote novelty item.
Free items, such as calendars, letter openers, mugs or buttons, bearing an advertiser's logo -- also referred to as advertising specialties. The purpose of such novelties is to keep the advertiser's name in front of its audience over time.