researcher

research association; research society / group of enthusiasts (as may be found in schools, colleges, etc)

smaller kanji historically used as a pronunciation guide, similar to modern furigana

kanji approved for regular use by the 文部科学省 (Monbu-kagaku-shō, “Japanese Ministry of Education”)

research & development; R&D

Sino-Korean vocabulary or "Hanja-eo"

The iteration mark 々, which indicates that the previous kanji ought to be repeated.

Alternative spelling of 漢字返し

(education) research project, done by Japanese schoolchildren during summer break, to be presented upon return to school

(orthography, historical) tōyō kanji (kanji that were declared official by the Ministry of Education of Japan on November 16, 1946, later replaced by 常用漢字 (jōyō kanji))