Polar Orbit
"An orbit with an orbital inclination of near 90 degrees where the satellite ground track will cross both polar regions once during each orbit." (National Aeronautics and Space Administration, 2014)
Sources
"Polar Orbit". NASA Glenn Research Center, National Aeronautics and Space Administration. Last modified June 12, 2014.
https://www.grc.nasa.gov/www/k-12/TRC/laefs/laefs_p.html#polar_orbit.
Accessed February 1, 2019.