A sanitary cove is the gentle curve you can get on tiles where they meet a wall, so there is no nasty sharp angle where even nastier bugs and germs can hide and breed and multiply. So far, so good, we've got the floor/wall interface covered in linear fashion. But if you try putting two of these tiles together in a corner you'll find they don't meet (unless you mitre them). To cater for that, manufacturers make special corner units, and you but your "ordinary" coved tiles up against them, on each side.

Unless they're simply being wordy and, not thinking about corners specifically, are talking simply about the floor/wall angle ... I say this because if they are specifying use of "corner angle tiles with sanitary coves", they don't appear to be specifying coved tiles for the straight runs ... unless that is supposed to be undersood in avec remontée.

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Note added at 33 mins (2009-05-19 14:57:24 GMT)
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At http://www.marazzitile.com/series/cimmaron/docFile
you'll find
"sanitary cove base in angle" and
"sanitary cove base out angle"
where you have to understand "in" and "out" as "re-entrant" and "salient" (seem to have been using those words a lot lately!).