Some Russian letters have multiple transliterations in English, like "Ш" (sh) and "Ж" (zh)

https://ams1.vultrobjects.com/keyb/rus/mastering-the-cyrillic-keyboard-a-beginners-guide-to-russian.html

Some Russian letters have multiple transliterations in English, like "Ш" (sh) and "Ж" (zh), which can confuse learners unfamiliar with Cyrillic nuances