CISH is an informal slang term that is commonly used to describe someone who is cisgender. Cisgender refers to individuals whose gender identity aligns with the sex they were assigned at birth. While CISH may be a commonly used term in some circles, there are plenty of synonyms that can be used instead. Some options include "not trans," "gender conforming," "gender-normative," and "gender-typical." Using more widely accepted terms can help to avoid confusion and ensure that everyone is on the same page when it comes to discussions of gender and identity.