Rubber Duckie (duck)

Rubber Duckie is Ernie's bathtoy duck and most treasured possession. Ernie has expressed his fondness for his duckie in several songs, most famously "Rubber Duckie", but the duck has also figured in "Put Down the Duckie," "D-U-C-K-I-E," and "Do De Rubber Duck." In Christmas Eve on Sesame Street, Ernie temporarily sells Rubber Duckie to Mr. Hooper in order to buy a present for Bert.

History
Though known to many as Ernie's toy on Sesame Street, the rubber duckie existed as early as the 1920s. Hasbro sold rubber duckie toys and the toy has been referenced often in pop-culture, such as in the Harry Potter novels, when Arthur Weasley, asks Harry what the function of a rubber duck is.