lower case
/ˈləʊə(r)/noun
mass noun
- small letters as opposed to capital letters (upper case)（字母的）小写体：
the name may be typed in lower case
名字可以用小写体打印
as modifier lower-case letters.小写体字母。
词源
referring originally to the lower of two cases of type positioned on an angled stand for use by a compositor （see UPPER CASE）.