What does the IR mean after these sites?

[AJAT]

For Snohomish county SERS system, Darrington, Index, Skykomish sites have an IR after their name in the data base. Does any one know what the IR stands for? Snohomish County Public Safety (SERS) Trunking System, Everett, Washington - Scanner Frequencies

 

[RBMTS]

Intellirepeaters

 

[nd5y]

Probably IntelliRepeater.

 

[AJAT]

Thanks ! I just did some reading about The IntelliRepeaters. Seems like they are designed for limited traffic in more remote areas or dead spots.