Here we go, a full list: http://dictionary.goo.ne.jp/help/jn/09_04.html

I asked about this on Google Plus:

https://plus.google.com/u/0/101848191156408080085/posts/8WRW6e6v6zy

Also got sent this link on Twitter:

http://dictionary.goo.ne.jp/help/jn/03_02.html
http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q105007965

Basically, × shows that the kanji is not a standard use Jyouyou kanji. ▽ shows that the reading is not in the list of Jyouyou kanji.

１ 目をいからしてじっと見る。鋭い目つきで見る。「じろりと―・む」

This is a usage example: じろりと睨む. The ― shows where to use the kanji.

動 means ‘verb’ (動詞)
マ means the verb is from the ma,mi,mu,me,mo list
五 means it is a ‘Godan’ verb (grammatical expression)
（四） means it is ‘Yodan’ verb in old Japanese.

Still checking about 動マ上一…

Say thanks to the guys in the Google Plus thread. They are awesome at Japanese :)

• This reply was modified 14 years, 3 months ago by  Michael.

Well, here’s to hoping! Make sure you keep that server topped up with resources. All those extra queries on the database must be fierce. The Textfugu lot are an active bunch :p. Nice job!