Riddle
 
of
 
the
Day
 
Pronounced
 
as
one
letter,
 
 
But
written
with
three,
 
Two
letters
 
there
are,
 
And
only
two
in
me.
 
I'm
double,
I'm
single,
 
I'm
black,
blue,
 
and
grey,
 
I'm
read
from
both
ends,
 
And
 
the
same
either
way.
 
 
What
am I?
Eye