I like how the original triplet's initials represent their behavior well:

- Opus is OP, like OverPowered

- Sonnet is SO, like your significant other (this was more meaningful in Sonnet 3.7 days)

- Haiku is HA, like the reaction to a bad joke

The latest model, naturally, needed three letters: FAB.

I'm now looking forward to ABS and LO