lcd.print and lcd.write at one line

Again, you cannot use the zero character inside a C string.
C uses the 0 to signify the end of the string.
There is nothing you can do to change that.
This not something that can be worked around.
That is why I said not to use zero. It simply cannot be used inside a C string.

Don's suggestion was a good one.
And that was that is that characters 8 to 15 are the same as 0 to 7
This means you can use 8 instead of 0
Because of that you can simple use 8 inside a C string instead of 0
to access the zero custom character.

Axinar:
Sorry floresta,
it doesnt work! i can complile it but is not showing anything.

This should work. Show your code.

keep in mind that 0x8 is \010 in octal
so to use the zero custom character you would use \010

And if your character set supports it, Don's other suggestion will at least get you
theta and sigma which will save you two custom characters.
Just convert the hex values to octal
theta is 0xf2 or \362
sigma is 0xf6 or \366

--- bill