It was "ticker tape," as in a "ticker tape parade." Back in the
days of the telegraph, the latest stock market figures were
transmitted over telegraph to the offices of the Wall Street
stockbrokers and bankers. The latest stock figures would print out
on a continuous roll of thin paper, similar to the rolls of receipt
paper that retail stores use today. The machine that printed out
this paper was called a "stock ticker," because of the noise it
made as it printed. The paper was called "ticker tape."
When a parade went by, people would throw shredded ticker tape
out the windows to the street below. These parades became known as
"ticket tape parades."
Computers and the internet eventually replaced the ticker
machine. Nowadays, brokerage firms and TV news networks use a
scrolling screen in place of the old ticker machines.