subscript
sub-script
adjective
(Of a character or symbol) written or printed slightly below the normal line.
"The '2' in H₂O is a subscript digit."
noun
A character or symbol written or printed slightly below the normal line of text.
"The '2' in H₂O is a subscript."
Thesaurus
Synonyms: inferior
Antonyms: adscript, superior, superscript