ruby characters
small characters placed aside a Chinese or Japanese characters to precise their pronunciation or to transliterate them into another script
en-GB/ˈɹuːbɪ ˈkæɹɪktəz/
en-US/ˈɹubi ˈt͡ʃɛɹəktɚz/
small characters placed aside a Chinese or Japanese characters to precise their pronunciation or to transliterate them into another script