What does nbsp mean?
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Merrill is a co-founder of Food52.
Could it be tbsp (tablespoon)?
Could be... a typo maybe. It's in the chocolate sorbet recipe (David L). thanks
I haven't seen the recipe, but nbsp is html for creating a space when scrolling down a recipe when inputting a recipe on a website. In html it's actually  , so it's possible that it was entered without the "&" so it came through as nbsp. But I haven't seen the recipe, so couldn't say for sure.
Wimpy Vegetarian is correct. is the HTML code for a "nonbreaking space"--i.e., a space that can't appear at the end of a line of print or, in groups of two or more, be collapsed to a single space (as web browsers do with multiple ordinary spaces).
If the code is entered withouth the leading ampersand, the user sees the characters "nbsp" instead of the intended space.
Thanks for the more complete answer sfmiller! When I typed the actual code in with the ampersand, of course it disappeared :-).