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: