What do you call the 16-bit groups of an IPv6 address?

[snarked]

I say double-colon.  However, either is correct, and I know of no other forms.

[jimb]

Think we need to coin something.  How 'bout "dcolon" or "colcol"?  I like short.  We can start a de-facto standard!  :)

[kcochran]

Think we need to coin something.  How 'bout "dcolon" or "colcol"?  I like short.  We can start a de-facto standard!  :)

I expect it'll just be double-colon for the foreseeable future.  All these years later and we've still got no term for "http://" aside from aitch-tee-tee-pee-colon-slash-slash.

[Ninho]

May I try quad-dot ? Unconvinced. Else double-colon, or: "colon, twice".

For the French speaking folk : "quatre-points" ? (Hint : a colon in French is "deux-points")

I guess it depends whether you are writing an authoritative essay or book, or speaking to someone on the phone and trying to ensure they grasp your instructions...

Is the nomenclature so important ?  - shrug -

[snarked]

"quad-dot":  Would imply one of the 2 IPv4 mapped (or compatible) IPv6 addresses:  e.g. ::FFFF:192.0.2.0

[milliamp]

I sort of like the idea of just calling them "quads" as a shortened version of "quad hexadecimal". that seems easy enough to use in conversation and it is technically accurate.
For ::, I too would call it a "double colon"