Question regarding goo j-j dictionary

Hey short question regarding the j-j dict on goo
If there is more than one way to write the word with kanji they have these strange symbols near them.
Here is an example.


Does any one know what the ▽ and × and any others mean? Or where to find a legend for this notation on their website?

Thank you for any help you can offer.

Hopefully this helps:

Also from here:

As far as I know, ▽ is for a Kanji reading that isn’t in the Joyo-Kanji list, and × is for a Kanji that isn’t at all in the Joyo-Kanji list.


The comment after the one you quoted goes over the explanation that their monolingual dictionary gives on the matter, which is nice and clear as well: