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Is it acceptable to spell it "spacebar" or must the word be spelled with a space in it? I'm using it to refer to a keyboard shortcut in my application's documentation.

Further, should it be capitalized? And if split into two words, should both be capitalized?

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Yikes! "spacebar" always, please. – Pete Wilson May 14 '11 at 17:07
Space Bar. – Callithumpian May 14 '11 at 17:50
up vote 7 down vote accepted

Definitely not capitalized: a Space Bar would be something like a Mars Bar or Milky Way, but less dense (facetious confectionery reference).

But whether you include a space is up to you. Originally so: the space bar is just below the X key, which requires a space to avoid confusion. However, spacebar is common enough not to be ambiguous by now.

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Thanks, that all makes sense. – Dov May 14 '11 at 15:46
+1 for facetious confectionery reference. And a good explanation. – simchona Jul 17 '11 at 20:14
This NGram suggests the single-word version really took over in the 90s, when the referent itself became common enough for 'ordinary' people to need the word. Leafing through a few dozen, it looks to me as if 5-10% are pointlessly capitalised. But I'd expect that to diminish over time, since it's largely a "techie" style (we even use SpaceBar sometimes! :) – FumbleFingers Jul 18 '11 at 3:32

All the keys on a keyboard are written with capital letters, so logic suggests it's written as "Spacebar".

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Do you have sources? As it is now, I disagree with you. – American Luke Nov 16 '12 at 23:40

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