Acho que não existe mais, mas até os anos 50 ou 60, era o meio "real time" de saber das cotações das bolsas de valores. Nem há mais exemplos no Google.

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Note added at 5 mins (2006-01-12 14:03:17 GMT)
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Hoje é objeto de colecionadores, e anunciam-se réplicas, veja:

Stock Market Ticker Tape ReplicaStock Market Ticker Tape Replica. $52.00 $45.75 sale Item #248AIT2000. Stock Ticker. The Stock Market Ticker is a replica of the 1909 electric machine that ...
www.e-corporategifts.com/ait2000.html

É uma tira de papel, provavelmente proveniente de um rolo, na qual estão impressas as cotações do mercado. Isto era feito por máquina.

Segundo meu dicionário (Collins Inglês-Inglês) isto é de uso antigo:

n (formerly) a continuous paper tape on which current stock quotations were printed by machine.

Em Portugal utiliza-se o termo original para designar o registador automático de cotações na Bolsa. Pode encontrar um exemplo no site "Dinheiro Digital", no menu do lado direito da página.

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Note added at 1 day 5 hrs 32 mins (2006-01-13 19:30:26 GMT)
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Ainda encontrei isto no site Investopedia.com (deve ter particular atenção ao que se diz no final):

"Firstly, a tick is any movement, up or down, however small, in the price of a security. Hence, a ticker tape automatically records each transaction that occurs on the exchange floor, including trading volume, onto a narrow strip of paper, or tape.

The first ticker tape was developed in 1867, following the advent of the telegraph machine, which allowed for information to be printed in easy-to-read scripts. During the late 19th century, most brokers who traded at the New York Stock Exchange (NYSE) kept an office near it to ensure they were getting a steady supply of the tape and thus the most recent transaction figures of stocks. These latest quotes were delivered by messengers, or "pad shovers", who ran a circuit between the trading floor and brokers' offices. The shorter the distance between the trading floor and the brokerage, the more up-to-date the quotes were.

Ticker-tape machines introduced in 1930 and 1964 were twice as fast as their predecessors, but they still had about a 15-20 minute delay between the time of a transaction and the time it was recorded. It wasn't until 1996 that a real-time electronic ticker was launched. It is these up-to-the-minute transaction figures - namely price and volume - that we see today on TV news shows, financial wires and websites. And while the actual tape has been done away with, it has retained the name."