[zyx321]

I did get an 'h' once. It's simply less common than numers like 3 or √7. It's even got 'i' (and everyone knows that's not a real number).

[meric]

Of course 'i' is a real number. 'There are i edges in this shape, where i is equal to the value of half of x'...You can also use it when texting informally e.g. 'i m out atm'.

[TophWells]

i is a real number, it's one-fifth of v.