Trincote is clearly some sort of structural clay tile (also called structural clay block, but since the ASTM norms use the terminology "tile," that's what I'd use). I suspect that "trincote" may, more specifically, be of the "load-bearing" class of structural clay tile.

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Note added at 51 mins (2009-11-18 15:02:09 GMT)
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A picture being worth a thousand words, here's a great illustration of various models of structural clay tiles, if you have access to Google books:
http://books.google.com/books?id=WQpDrhKfv9wC&pg=PT43

And some definitions: ""Hollow clay tile is similar to brick in composition but not in construction. Tile, which is made by extrusion, is much lighter than brick, owing to internal voids contained within relatively thin ribs. "
http://books.google.com/books?id=JC7NSIdtOfgC&pg=PA509

"structural clay tile is either hollow or cored burned-clay masonry unit having cores that are parallel either in the vertical or horizontal direction."
http://books.google.com/books?id=TiwiGsfo5i4C&pg=PA278