"H Movement" religion on 1921 Census for Ontario?

ishkabibble

This is the second batch I've received that has the abbreviation H Movement for religion. Does anyone know what it means and if there is a correct selection for it? Thanks

Áine Ní Donnghaile

I've also found the term in the 1911 Canada Census.
I believe it may refer to the "Humanist Movement" which is generally considered non-sectarian.