Talk:Unit prefix

"The CGPM has decided to extend this z–y backwards through the alphabet"
The citation for this is a personal website that claims it without giving a source. I can't find evidence of it. Does anyone have a RS (ideally BIPM) for this? 128.12.245.10 (talk) 08:00, 20 April 2017 (UTC)

S used as an SI prefix?
In this page i came across this: The initial letters were changed because s and h, from previously proposed ascending hepta and descending septo, were already used as SI units and prefixes (in German, septo would be pronounced as English zepto), and because the o of octa/octo could be confused with zero. I checked the SI prefixes and none have the letter S as their symbol. Also the article clearly states: or if letters such as S and T, which are already in use as SI units or prefixes, will again be skipped. Are there any SI prefixes using the letter S as their symbol? Could someone tell me about this? Thanks! 24.150.136.68 (talk) 00:45, 3 May 2017 (UTC)


 * S, s, and H are SI units, while hour is an accepted non-SI unit. Adding them as prefixes would create confusion. Jeblad (talk) 19:54, 2 November 2019 (UTC)

quecca and ronna
Proposed new ones for 10^27, 10^30. "If approved, the new terms could be formally introduced in 2022. They would be the first prefixes added since 1991." Tom Ruen (talk) 18:42, 15 February 2019 (UTC)


 * They have now been confirmed: https://phys.org/news/2022-11-earth-ronnagrams-metric-prefixes-voted.html
 * > Joining the ranks of well-known prefixes like kilo and milli are ronna and quetta for the largest numbers—and ronto and quecto for the smallest. wjdp 23:17, 21 November 2022 (UTC) — Preceding unsigned comment added by Pimms1 (talk • contribs)

x, w, v prefixes
Although these old speculations are now about to be overtaken, the x and v prefixes did make it into Greg Egan's Schild's Ladder with its "vendeks" and "xennobes". Shame about the w, though. :) Double sharp (talk) 20:22, 18 October 2022 (UTC)

"Una (prefix)" listed at Redirects for discussion
The redirect [//en.wikipedia.org/w/index.php?title=Una_(prefix)&redirect=no Una (prefix)] has been listed at redirects for discussion to determine whether its use and function meets the redirect guidelines. Readers of this page are welcome to comment on this redirect at until a consensus is reached. Shhhnotsoloud (talk) 15:27, 11 March 2023 (UTC)