#answer to your question @arthur.grafo: Yes, the @ before the name is required. The # is being used for tags (hash-tags). You can also set tags by using the # sign for comments. This is not yet well supported in the current front-ends (links go to the trending page for main posts) but may be in future.
I thought about adding a possibility to filter the comments in the replies tab (post overview) on SteemWorld and maybe I will do so in the coming months.
I'm glad I asked, as I've seen a number of poster using the # sign for names also and I can now advise them.
Thanks for always taking the time to respond.