For anyone else who was wondering, the 2 in LGBTQ2 apparently stands for "two-spirit", which is:
a term used to broadly capture concepts traditional to many Indigenous cultures. It is a culturally-specific identity used by some Indigenous people to indicate a person whose gender identity, spiritual identity and/or sexual orientation comprises both male and female spirits.
First time I've ever heard of either term, but I'm not Canadian!
And we are better for it.