Strange Symbols - FlightRadar24

Aeronautics & Space Engineering general discussion
#1

Saw these symbols today on Flightradar24.com - never saw them before. Can anybody explain?

FR24
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#2

Chisinau specifically? It appears like there are airport vehicles that are broadcasting ADS-B information

#3

This link is a little bit of help. F24’s FAQ wasn’t much help either.