We're going to build up this taxonomy if you like, but the reason it's relevant is, associated with each one of those types is a set of operators that expect certain types of input in order to do their job.

我们将会建立这种分类，但是这相关的原因是，对于每种类型都有,和之对应的一个操作集,这个操作机对一些输入,做出规定的操作。

麻省理工公开课 - 计算机科学及编程导论课程节选

The SEC is conducting an inquiry into whether high-frequency firms use those order types to jump in front of other investors.

WSJ: High-Speed Trading in the Spotlight

High-frequency trading now makes up half of the volume, while an explosion of order types does little more than guarantee confusion for ordinary investors, increasing stress.

FORBES: Q: Why Did the Investor Cross the Road?

Jockeying for listings is nothing new for exchanges, but has taken on a new tone over the past year with proposals for new order types for ETPs and even fee reductions for certain structured products ( PDF), now grouped into the broader ETP category.

FORBES: ProShares Considers Listing Products with BATS