Which of these symbols is called an "ampersand"?

The ampersand, also known as the and sign, is the logogram &, representing the conjunction "and". It originated as a ligature of the letters of the word et (Latin for "and"). In everyday handwriting, the ampersand is sometimes simplified in design as a large lowercase epsilon Ɛ or a reversed numeral 3, superimposed by a vertical line. The ampersand is also sometimes shown as an epsilon with a vertical line above and below it or a dot above and below it.

Source: Wikipedia