"Mathias.redd" generally refers to either Mathias Red, an electronic music artist, Mathias Reddmann, a Belgium-based communications professional for the EU, or Reddit discussions regarding Mathias Rust, who famously landed a plane in Moscow's Red Square in 1987. The term covers diverse topics ranging from music releases on Spotify to historical Reddit threads on aviation and the Cold War. For more details on the historical event, see discussions on Reddit www.reddit.com/r/todayilearned/comments/rhrrto/til_that_in_1987_mathias_rust_a_west_german/.