他の東京メトロで見つけた間違い

I think people are confused about punctuation.

• 句読点 (くとうてん) (n) (ling) punctuation mark(s); (P);

Sometimes it seems people don't care about it. However, it has meaning!

For example, using a period (.) in a word. The reason to use a period in a word is for an abbreviation. The period is used at the end of the abbreviation.

• 省略 (しょうりゃく) (n,vs) omission; abbreviation; abridgment; abridgement; (P);

For example, "mister" becomes "Mr." in a title. "Et cetera" becomes "etc.".

This photo has some English which reads:

× Track. 2

That period after "Track" is really strange. I think what they meant was:

○ Track Number 2
○ Track No. 2
○ No. 2

That's a funny abbreviation, though, isn't it? If "number" doesn't have an "o", why do we write "no."? The answer is here:

http://en.wikipedia.org/wiki/No.

In short, it comes from Latin-based languages, like French and Spanish, in which "numero" means "number". It's interesting to note that in Middle English, "number" was spelled "nombre", also with an "o".

I don't want to abbreviate my sleep, so it's time for me to end this post. Good night!