Does anyone know what ▼ is in mono-lingual dictionaries?

The marks aren’t standard though. In some other dictionaries you’ll see an X for non standard readings.
There are other triangles too, that aren’t black, those usually mean that the kanjis are jojo Kanji.

Usually (at least in EPWING files) there will be a page explaining the symbols and abreviations used in the dictionary :+1: