So I learned (?) something new (?) today reading Lennard Zinn's column
at Velonews:
https://www.velonews.com/2020/01/tec...blowoff_503717

What I learned was the term "crochet-type rim".

Looking it up, some sources say this is just another name for hook-bead,
BUT:

https://en.wikipedia.org/wiki/ISO_5775#Rims says:

Both crochet (C) and hooked-bead (HB) rims have inner profiles
that curve inwards near the outside diameter of the rim to
provide a hook that helps retain the tire bead under high
pressure. On modern bikes crochet rims are most common and
hooked bead rims are rare. The distinction is primarily that
hooked-bead rims lack the defined bead seat of straight side and
hooked bead rims. The tire is held in position radially by the
hook without a bead seat playing a role. Without a bead seat,
the primary designation of the diameter in terms of the bead
seat is not applicable, and the governing diameter is the OD.

Sentence #3 pretty clearly has a typo, but I can't figure out the
correction, and I cannot find any images on google that directly compare
hooked-bead and crocheted (also sometimes mis-named "crotched").

I suspect the "HB" in the quoted passage above is really referring to an
obsolete design, and that the quoted writer would even call the 70's
Mavic Mod E "crocheted" rather than "hooked-bead," even though we all
called them hooked-bead.

Can anyone clear this up with an authoritative source?

Mark J.