What is the meaning of ?

atomic nucleus

kernel

core, nucleus

cell nucleus

chữ Nôm form of cây (plant; tree)

chữ Nôm form of cơi (to build higher)

chữ Nôm form of cơi (betel and areca-nut tray)

chữ Nôm form of gai (hemp-nettle; thorn)

chữ Nôm form of hột (Central Vietnam and Southern Vietnam form of hạt)

Source: wiktionary.org