ConTeXt users can use the
delimitedtext environment which is used for quotations and blockquotes. With the
nextleft you can set a symbol which is shown at the left margin of each line.
A limitation of this method is that you to disable the indentation of the paragraphs because the symbol in the first line will be placed at the wrong position.
Even though one can fix this for the first line when you never have more than one paragraph there is a better solution with the help of the
linenumbering mechanism. The counter for the line numbers can be hidden with the