What word names greeting cards sent on Valentine's Day?

Greeting cards sent on Valentine’s Day are called valentines.

The noun refers both to the cards themselves and, in older usage, to the person receiving or exchanging a romantic message. Valentines may be anonymous or signed, and modern versions often include poems, illustrations, hearts, flowers, humorous messages, or declarations of affection. The word comes from the holiday associated with Saint Valentine.

The custom developed gradually rather than beginning with a single verified card written by the saint. Medieval European literature connected Valentine’s Day with courtly love, and the practice of exchanging love messages expanded over time. One of the earliest surviving examples is a 15th-century poem written by Charles, Duke of Orléans, for his wife while he was imprisoned in the Tower of London. English examples also appear in the 1477 Paston Letters.

In 18th-century England, sending valentines became a popular way for lovers to express affection, alongside giving flowers and confectionery. During the 19th century, improved printing and cheaper postage helped mass-produced cards replace many handmade ones.