What is 'other' in the tracking stats?

I’m new to this stuff, having just installed a flightfeeder earlier this week. I see in the stats for my flight feeder the position and aircraft data acquired by ads-b and multilateriation; and understand both of those, but also see “other”. Was just wondering if someone could explain what “other” is.

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It is explained in this older newsletter

https://mailchi.mp/flightaware/ads-b-network-news-l3ktu01tdm

Biekerc: Thanks! The news article explained it.