BLANK!

Summary

evaluation separator, no rendering (shows in lists via commas)

Kind

Fundamental type, whose antiform is VOID!

The comma. In code it separates expressions, making boundaries clear while producing nothing itself:

reduce [1 + 2, 3 + 4]

In a list it shows as a comma, so [a, b] has three elements.

Its antiform is VOID!, and its quasiform is the bare tilde ~.