The complex, [Co(NH3)5NO2]2+ exhibits linkage isomerism as NO2 group being an ambidentate ligand can bind to a metal atom either through N or O atom and, hence two different isomers are formed. These are:

[Co(ONO) (NH3)5]2+ and [Co(NO2) (NH3)5]2+

 

Dear Student,

There seems to be some problem in your question as it is not clear what you are asking for. 
NO2 is an ambident ligand and can attach to the metal through two sites i.e. N and O. Therefore, it shows linkage isomerism. The two isomers are [Co(NH3)5(NO2)]2+ and [Co(NH3)5(ONO)]2+. Their IUPAC name is Nitropentamminecobalt(II) ion and Nitritopentamminecobalt(II) ion. 

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I think the order depends upon the oxidation state....alphabetical order is followed while writing thwir IUPAC names
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(ONO) and (NO2) are written in this way to show linkage Isomerism.
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What are you looking for?