marquee

(Britain, Australia, New Zealand) A large tent with open sides, used for outdoors entertainment.

(US) A projecting canopy over an entrance, especially one with a sign that displays the name of the establishment or other information of it.

(US, by generalization) Lights that turn on and off in sequence, or scrolling text, as these are common elements on a marquee.

(Internet) A banner on a web page displaying text that scrolls horizontally.

(computing) In graphical editing software, a special selection tool, used to highlight a portion of an image.