Snowman didn't work for me, but the other characters I tried did. I had some trouble with "therefore" because there were a lot of virtually identical symbols, but I can't blame it for that.

It mentions not all characters are in the the database.

ETA: it's got a pretty weird snowman. http://shapecatcher.com/unicode/info/9731

By immitating this rendition I was able to bring it up.