olemus
diagramm mitmemõõtmeliste või tsükliliste andmete esituseks
tasandil, keskpunktist radiaalselt hargnevate telgedega

Wiktionary:
a two-dimensional chart of multivariate data, with three or more quantitative variables represented on axes starting from the same point

näiteid
http://www.advsofteng.com/images/multiradar_g.png

http://www.internet4classrooms.com/images/07_finalradar.gif

https://duckduckgo.com/?q=radar+chart&t=h_&iax=images&ia=images