Letters which have a Christian connection?

[Hello]

This is a question I've asked on quite a few forums but I'm after information from people here.

I thought the letter "T" when it was made into a lowercase "t" might have had a Christian reason behind it because it looks like a cross. Do you think there could be any truth in this?

So I am wanting to know if there are any letters or numbers which have a Christian background, purpose or connection. Letters like Yy, Kk, Xx, Ww or numbers like 4 which I think once looked like an X.

I'm accepting any info no matter how small or what letter or number it is about
thanks

 

[Ivy]

Here's something:

http://en.wikipedia.org/wiki/Xmas

I, for one, have regularly used "xmas" seeing it as Christ-honoring, not the other way around.