Which order type is not available?

The order type that is not available is "Volatility Auction Only." This is because Eurex does not have a specific order class designated as "Volatility Auction Only." Instead, Eurex offers well-defined auction types for opening and closing sessions, known as Opening Auction and Closing Auction, respectively. These specific auctions are designed to facilitate price discovery at the start and end of the trading day.

The concept of auctions in the context of Eurex is crucial, as they allow for the accumulation of limit orders before a market opening or closing. However, the notion of a volatility auction specifically does not exist in these formal terms, which makes that designation the outlier among the options presented. It’s essential for traders to understand the available order types to effectively navigate trading on Eurex and leverage the auction mechanisms that are indeed in place.