Lots of philology this weekend... "Standard" is the symbol you place up high, to "stand hard [firm]", a mark to behold, as if - then - a parameter.

So, 'Standard Ebooks' is read as "model ebooks, exemplary of how they should be made", and the same for the fireworks... In spite of David Mitchell who wanted to joke on "standard" as "common" - which is an overly optimistic deviation, and Mitchell fumbled there, while remaining a good support act for international treasure the Bob Mortimer, the "Standard" (of himself).