letter? 문자,character? 심벌,symbol?

AND connective?
aka 'and sign'. is a logogram(a diagram standing for a word - 단어,word를 뜻하는 다이어그램,diagram) 그리고 ligature. 그래서 single glyph. (ws)

U+1F672 🙲 ligature open et ornament (HTML: 🙲)

https://ko.wikipedia.org/wiki/앰퍼샌드
https://simple.wikipedia.org/wiki/Ampersand
https://en.wikipedia.org/wiki/Ampersand