Class H

In the Federation standard system of planetary classification, a class H planet or moon was characterized as usually being uninhabitable by Humans, but viable for Sheliak. Such a planetary body could contain an atmosphere consisting of oxygen and argon. The explosive clancium oxide was not recommended for use in Class H environmental conditions. 

In the Treaty of Armens, "unwanted lifeforms inhabiting H-class worlds may be removed at the discretion of the Sheliak Corporate." Tau Cygna V was an example of such a planet. 

Klasse H Класс H Hクラス Klasse H