Template:M summ Equity Derivatives 1.29
The sort of thing you would like to think did not need to be defined, enormously, but then there is what to do if the exchange closes unexpectedly halfway through its day — that is still an Exchange Business Day, but it may affect the Valuation Time. For much tedium in this regard do directly to the Disrupted Days and Valuation provisions of section 6 and the Physical Settlement provisions of Section 9.