I have to say that Dgraph± seems to be a really problematic name because of the fact that there is no way to know how to pronounce it ( I always thought “GraphQL plus minus” which really isn’t great ). Adding to that is the fact that most people wouldn’t even know how to type it. I can type the ± on a Linux computer using the composer key, but I don’t know how you type it on a Windows computer without opening up the character map, searching for it, and copying it to the clipboard from there.
I think the best option above is DQL because it most clearly points out what it is. It’s the Dgraph Query Language, even if it is very close to GraphQL, you don’t want people getting mix up with it and GraphQL. Having the names too similar to each other seems like it would make it easier to get one mixed up with the other, and like @ajeet said, it causes problems with SEO when the only difference is the ± character.
I do undertand the origin of GraphQL± and it makes sense, but it just doesn’t work out so nicely in practice I think.
I think having it on the Dgraph website that DQL is very close to GraphQL with some added features and some removed features, just like it is portrayed on the website today, is more than enough for me to get a quick understanding of its similarity to GraphQL, without having to name it GraphQL±.