Unicode has a lot of characters that look like latin characters upside down:

ƃop ʎzɐʃ ǝɥʇ ɹǝʌo sdɯnɾ xoɟ uʍoɹq ʞɔınb ǝɥʇ

I used the converter I found here: https://www.fileformat.info/convert/text/upside-down.htm