Hair splitting for AnthonyG?

[tomcarman]

A bit off topic but relevant nonetheless. AnthonyG may know the correct answer to this being he studied metallurgy at Temple. I have been admonished several times on using the term "angle iron" by structural engineers. It was pointed out to me that though it is in fact angled it is not iron but steel. There is a difference as steel is an alloy. Perhaps a clarification is in order? Recently, and I don't recall which member has been a self-appointed hairsplitter regarding these sorts of things. LOL. This post is intended to be in good humor regarding proper terminology. For those who do wood work is it a lag bolt or a lag screw? If it's a lag bolt then why is it shaped like a screw and why is a machine screw shaped like a bolt? Just wondering.
Tom