Question regarding goo j-j dictionary

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

かつて【▽曽て/×嘗て】の解説

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:

https://japaneselevelup.com/the-j-e-to-j-j-dictionary-leap-of-faith-1-escape-from-comfort/

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.

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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:

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