This has always been a pet peeve of mine. Why wouldn't symbols be supported? I mean, if I search for 'A' for example, I will get every note that contains the letter A, which would be all of them. Why can't symbols be treated as characters. It just makes no sense. It would help so much when searching for stock symbols (preceded by $ on Twitter) for instance. If I search for SHOP I get every note that contains the word SHOP instead of notes about Shopify. So a search for $SHOP would be most useful. Again, this just makes no sense.
Why would they just say, "OK, we need a fantastic search tool since we are essentially a free-form database. We're even going to search within photos. But it makes sense to only allow search for alpha and numeric characters. We'll ignore common symbols like # @ and $ because it would allow people to easily find hashtags, email addresses, and stock symbols.