Iterated nand

[Xorter]

I am interested in iterates (and uniterates) of logical operators, like nand, xor ... etc. .
Let's investigate the nand op:
x↑y = ¬(x&y)
Iterating x O y means this: x O x O ... O x (y-times)
Thus
x ↑ x ↑ ... ↑ x := x ↑↑ y
x ↑↑ 1 = x
x ↑↑ 2 = x ↑ x = ¬x
x ↑↑ 3 = x ↑ ¬x = ¬(x & ¬x) = x v ¬x
x ↑↑ 4 = x ↑ (x v ¬x) = ¬(x & (x v ¬x)) = x & ¬x
x ↑↑ 5 = x ↑ (x & ¬x) = ¬(x & (x & ¬x)) = x v ¬x
x ↑↑ 6 = x & ¬x
x ↑↑ 7 = x v ¬x
... etc.
So
x ↑↑ 2k = x & ¬x
x ↑↑ 2k-1 = x v ¬x
where k is bigger integer than 2
My question: Can k be any real or complex number?
(In my view to do this, we should know what "between" & and v is.)