The Hummer card is a levitation magic

Magic (illusion)

Magic is a performing art that entertains audiences by staging tricks or creating illusions of seemingly impossible or supernatural feats using natural means...

 trick in which, unlike many other levitation tricks, a regular playing card

Playing card

A playing card is a piece of specially prepared heavy paper, thin cardboard, plastic-coated paper, cotton-paper blend, or thin plastic, marked with distinguishing motifs and used as one of a set for playing card games...

 floats, hovers, spins and flies around the body of the magician in a seemingly impossible manner. The trick works for any form of card such as a credit card or business card. Due to this flexibility it is often used as street magic

Street magic

Street magic falls into two genres; traditional street performance and guerrilla magic.- Traditional street performance :The first definition of street magic refers to a traditional form of magic performance - that of busking. In this, the magician draws an audience from passers by and performs an...

or a fancy way for a corporate magician to hand out his business card, and is very easy to work into almost any routine. The trick was originally invented by Bob Hummer and is often sold on mainstream magic sites.

It is often referred to as the Hummingbird card or and some dealers sell a rebranded version with a variety of different names, such as Hummer's Whirling Card.