Scale Degree Names Theory Things   William Wieland
                                     
 1 Tonic
 7 Leading Tone*
 6 Submediant
 5 Dominant
 4 Subdominant
 3 Mediant
 2 Supertonic
1 Tonic

* When 7 is a whole step below tonic in natural minor or
 descending melodic minor, it is called Subtonic.

X2 the two is a superscript

B3 the three is a subscript
Scale Degrees an excellent explanation at musictheory.net

Drills: