Character data from the Unicode Unihan database. Korean reading, 훈음 and vocabulary from the libhangul hanja dictionary by Choe Hwanjin (BSD 3-Clause). English translations of whole words from kengdic (MPL 2.0 / LGPL 2.0+), a community dictionary — the occasional entry is wrong.Levels are derived, not official — they are not 한자능력검정시험 급수. The ordering combines Unihan’s kGradeLevel (the school year a character is introduced in Hong Kong, present on 1,539 of the 1,800), total stroke count, and how many national standards treat the character as core.