Queerplatonic
A committed relationship that isn't romantic — and isn't just friendship either.
A queerplatonic relationship carries the commitment usually reserved for romance, without being romantic. People in one might live together, share money, raise children or plan their lives around each other, while not being in love in the way that word usually means.
The term came out of asexual and aromantic communities, where the gap between friend and partner was doing far too much work. It's since been picked up much more widely.
What it looks like is negotiated rather than given. There's no template, which is both the difficulty and the point.
It gets called a QPR for short, and the people in one are often each other's zucchini — a joke word that stuck for lack of a serious one.