I would like to know if there is any weight associated with a html link (its backlink) when google does crawling/indexing. Will 1,2 & 3 be ever considered as a backlink by Google?

1. <a href="xyz.com">1</a> // one character link
2. <a href="xyz.com"> </a> //blank space link
3. <a href="xyz.com">!</a> //special character link
4. <a href="xyz.com">keyword</a> //meaningful word link
    

I hope my question is understandable and guess this is right forum. I don't know to put it in other words.

Thanks in advance.