That is not exactly true. A "meta search engine" pays importance only to the meta tags and meta discriptions of the HTML code.
A search engine that searches many search engines is a mashed search engine, because it mashes the api of dfferent search engines.
Examples for meta search engines are: http://metaspider.com/ or http://megaspider.com/ (very old)
Examples for mashed search engines are: http://dogpile.com/ or http://avasearch.com/
metasearch engine
Metasearch Engines
metasearch engines
Search aggregator or search engine aggregator. It is actually called a Mashed Search engine - Like Dogpile.com or Avasearch.com and the reason for that being is because their technology is based mostly on mashing the api's of Google, Bing, Yahoo and Ask
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The Deep Web is important as it allows access to more relevant and organic content compared to content from search engines. Deep Web is also called the Invisible Web.
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Not really, but there is a nice messenging application called Empathy that allows you to log into several IM services at once.
The forward propulsion of an aircraft is called thrust.The thrust is given by the engines.
The site called Playr allows you to play all the Pokemon games (or at least several) for free, you can even save!
Some of the most used search engines are: Google, Yahoo, Bing, Ask, Answers, and the new one Dogpile. Dogpile, wich came out at about the year of 2011. It allows kid friendly searches on the internet for almost nearly every computer.
They are called steam trains because they are pulled by steam engines.
I posted the list of search engines from wikipedia in the related links box below.