Right angle
From Tardis Wiki, the free Doctor Who reference
A poster in a Deffry Vale High School classroom claimed that a right angle was 90°. (TV: School Reunion [+]Loading...["School Reunion (TV story)"]) According to a book owned by Chloe Webber, the meridian lines of the planet Earth ran at right angles to the parallels. (TV: Fear Her [+]Loading...["Fear Her (TV story)"])
