HSK10+
tán
altar
土 Meaning component
tǔ
earth
亶 Sound component
dǎn
sincere
Seal script
Clerical script
Regular script
坛 (壇)
altar; arena, examination hall; platform; rostrum
论坛
forum (for discussion)
祭坛
坛
platform
政坛
political circles
乐坛
music circles
Academia Sinica
Make Me a Hanzi
Unicode
Baxter-Sagart
CC-CEDICT
SUBTLEX-CH
MTSU Chinese text computing