My passwords must contain at least three backspaces, one Function key and three ‘any’ keys.
Why not quaternions?
What about the characters in the Flanders and Swan song “cha, pop, aiee”? The cha was pronounced as a German achlaut, the pop is done with a finger inside the mouth popping a cheek and the aiee is what it sounds like.
I think we will end up with biometric passwords.
If you add up the Unicode values of all the characters in your password, and apply the “sin” function to the total, the result must be <= .5.