Ten letters of the alphabet

A H I M ? T U V W X


These nine letters of the alphabet belong together for a reason.
Once you figure out the reason, find the missing letter.

A difficult one, I guess .......

Have fun,

IvanH

O

Originally posted by royalchicken
O

I was thinking about 'O' too, 8 spaces and then one, and then 8 again and then one....but that doens't aply with the next 4 letters...

Originally posted by LivingLegend
I was thinking about 'O' too, 8 spaces and then one, and then 8 again and then one....but that doens't aply with the next 4 letters...

I always thought that the letter after M was the N...but indeed, it doesn't work for the rest of the letters...

Ton and Nuathala

Originally posted by royalchicken
O

... and what is the reason ?

Originally posted by ivanhoe

... and what is the reason ?

If you hold them up to a mirror, all of these letters look the same. Y can as well depending on how you write it, but the other letters don't.

Something to try with a mirror:

Get a piece of paper and write 'CHICKEN' on it. Turn the paper upside-down and hold it up to a mirror. If you look at the image in the mirror, you'll see that the 'N' is reversed - why?

Originally posted by Acolyte
If you hold them up to a mirror, all of these letters look the same. Y can as well depending on how you write it, but the other letters don't.

That is the correct answer. Ten points for Acolyte !!

Originally posted by Acolyte
Something to try with a mirror:

Get a piece of paper and write 'CHICKEN' on it. Turn the paper upside-down and hold it up to a mirror. If you look at the image in the mirror, you'll see that the 'N' is reversed - why?

All the other letters look the same when flipped upside down and viewed from the back This is the same as reflecting them in a horizontal plane and they all have horizontal symmetry.

N has no horizontal symmety but it goes back to front when reflected in a horizontal plane.