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Differences in bottom covers on MacBook and MBP

I am having difficulty in figuring out what to call the macbook or macbook pro A1278 models. I believe i have seen both a macbook and a pro of the same type and i am cofused as to what makes them a Unibody or splitbody (so i have seen them referred to as dual bottom covers; one for access to the battery and the bigger one for access to the MLB)....

I noticed on you website for the 2009-11 macbooks that they are all listed as unibody... is this correct? If so, what makes a unibody a "Unibody" if it's not the fact of a single bottom cover?

Is the split body only for the MacBooks and not the Pros? I mean, do only the Pros have a Unibody (single piece) or do they also have a splitbody (dual bottom cover)? so how do i know which one to reference when searching for the piece to repair my macbook or MBP?

Update

I agree that the splitbody is an earlier version. I have seen the term "splitbody" in reference to the dual bottom access covers but don't recall where i seen it used—but it made the most sense to me and i just wanted to seek assurance of minds. I personally have noticed the "Unibody" term always being referenced to the single bottom access cover and it never made sense to me as to why the Macbooks A1278's with the splitbody (SB) design of the bottom cover was referenced as a unibody; all laptops to my knowing split apart for access, so the simple logic of removing an access cover to gain access to Main Logic Board (MLB) doesn't incorporate the splitbody sense when referencing a name that identifies what we see when "observing a book by its cover". Using the above terms splitbody or unibody helps identify the two different bottom covers for sure and it seems to make a lot of sense in general. Thanks for your response so quickly. I'm guessing that my question has been answered by plain old common sense.

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"Split Body" is a term new to me... where have you heard it used?

For what it's worth in the Mac Users community ''Unibody means milled from one block of aluminum or composite... no openings for removable batteries. '' The the original white or black polycarbonate MacBook (shipped from May 16, 2006 to October 20, 2009) had a user removable battery last "pre-Unibody" MacBook Pro was discontinued on January 6, 2009 it too had a user removable battery.

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Ahh. That also makes sense being milled from a single block. It is also good to know, that, to be on the same terms with what I gathered about the bottom cover(s) is to know that the dual cover is referenced as the "Pre-Unibody". I had trouble seeing the difference on the ifixit repair diagrams website which easily identified a visual difference by WORDS which is the first thing to notice. Im good to go and confident with the diligence manifested. Thanks

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I've seen the A1278 2008 -'09 with both the solid bottom and the split bottom. I tend to think the split bottoms are the earlier versions. There is a A1278 non-Pro version and I think the split bottom are that one. The split bottoms tend to beat up much easier.

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I have noticed the damaging potential too which is something to consider when owning one

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bigdaddychaddy will be eternally grateful.
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