organic chemistry - Carbon with two double bonds and oxygen name

I have a compound like this:

$$\ce{CH2=C=O}$$

I wonder if it is a functional group or a normal group. As a functional group I couldn't find out. Is it a normal compound or a functional group and what is it's IUPAC name

Answer

According to the current version of Nomenclature of Organic Chemistry – IUPAC Recommendations and Preferred Names 2013 (Blue Book) the name of the given compound is the systematically constructed name for ketones.

Therefore, the preferred IUPAC name (PIN) is ethenone.

The name ketene is retained, but only for general nomenclature.