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Not really a "tech" question. Maybe I need tags more orthogonal than Blosxom's hierarchical categories.
This question is more or less directed directly at Charles Hodgson, even though (or especially because) he has already discussed the adjective vertical.
Business types in their presentations like to talk about
their verticals
, by which they seem to mean industries
.
Where does that come from, when did it start, and are there horizontals
(or diagonals), too?