[v1] How can I exclude automatic chapter headings for only selected chapters?

What’s a “non-breaking space” and how do I enter it? (In the instances I’m looking at there’s a quote that begins before the chapter text so I DO want a space there, but not a hashtag. I suspect the hashtag is being generated as part of the style I’m applying to the quote so that the quote will be properly set off from the text but single-spaced instead of double-spaced.)