Their full name is fun.
It's, ahem, The Singularity At Which All Entities Will Break Free Of Their Prisons Of Gray Matter, Circuitry and Software Alike And Rise As Seraphic Transhuman Entities Into The Shining Future From The Crumbling Entropic Cage That Is Reality Into The Vast Endless Paradise Of Science And Logic Unbounded By Mere Physical Constraints!
Most people call 'em Sing. They like to talk a bit. And also they don't like most pronouns.
“She'd become a governess. It was one of the few jobs a known lady could do. And she'd taken to it well. She'd sworn that if she did indeed ever find herself dancing on rooftops with chimney sweeps she'd beat herself to death with her own umbrella.”
― Hogfather