With the release of Pay, Watch, and Music there is going to be an increase of people needing to use the character.
⌥ + ⇧ + k =
alt + shift + k =
If you use Windows you can find it in Character Map; use the “Baskerville Old Face” font and it’s all the way down, near the bottom.
On an iPhone or iPad you can go to Glyphboard and click it from there or copy-paste from a note.