How Many Common, Unique Letters Do *You* Think There Are?

[pfeaster]

Feel invited to also expand your answer into a range, explain your cutoff, list your alphabet, and generally explain yourself. I'm curious about all that too!

This is just a casual educated guess, right?  In that case, about thirteen common ones:

1. The "curve" [e] -- also first component in [a], [o]; doubled in [ch] etc.
2. The "line" [i]
3. The up-flourish on [s], [r]
4. The loop-flourish on [g], [m]
5. The mid-flourish on [n], [o], and [b]
6. The down-flourish on [y], [l]
7. The "bar" in [ch] etc.
8. The plume on [S]
9. [q] with its forward projection
10. The upper part of [p], [t]
11. The upper part of [f], [k]
12. The lower part of [p], [f]
13. The lower part of [t], [k]

These would be "graphemes" rather than an alphabet.  If there's a corresponding "alphabet," I'd suspect that its relationship to component graphemes could be loosely analogous to that of Hangul, Melville Bell's Visible Speech, Roman numerals in the sense that [x] and [xx] and [x̄] have different derived "meanings," or the character sequences of Stenotype -- with emphasis on "loosely."