The use of "ю" as a symbol for the exponent in some Soviet versions of ALGOL

Our article Scientific notation claims that

The ALGOL 60 (1960) programming language uses a subscript ten "₁₀" [between the significand and the exponent of a number written in scientific notation], for example: 6.0221023. This presented a challenge for computer systems which did not provide such a character, so ALGOL W (1966) replaced the symbol by a single quote, e.g. 6.022'+23, and some Soviet ALGOL variants allowed the use of the Cyrillic letter "ю", e.g. 6.022ю+23. Subsequently, the ALGOL 68 programming language provided a choice of characters: E, e, \, ⊥, or ₁₀. The ALGOL "₁₀" character was included in the Soviet GOST 10859 text encoding (1964), and was added to Unicode 5.2 (2009) as U+23E8 ⏨ DECIMAL EXPONENT SYMBOL.

The part I have a question about is Soviet Algol variants allowing "ю" to be used for this purpose. This was originally added by NevilleDNZ in 2017 in special:diff/774402196, and I expect it is probably correct. But it has never had a source.

Since I don't read Russian, it's hard for me to track down sources about this. Can anyone find a source for this claim? –jacobolus (t) 03:43, 18 October 2026 (UTC)

Aaccording to Google search, the Russian translation of the ALGOL 60 Report on Math-Net.Ru, "Сообщение об алгоритмическом языке АЛГОЛ-60" would confirm this. However, when trying to access this translation I get a timeout. It is quite conceivable – even likely – if it has been digitized, that the claimed "ю" is a scanno for ₁₀.  ​‑‑Lambiam 10:15, 18 October 2026 (UTC)

@Lambiam: - the link worked for me. I have reuploaded it to Dropbox at this public url. Please let me know when you have it, so that I can delete the Dropbox copy. ~2026-56016-87 (talk) 15:42, 18 October 2026 (UTC)

Got it, thank you. I've added it to my private repository of ALGOL 60 Reports.  ​‑‑Lambiam 17:59, 18 October 2026 (UTC)

The difference between the bitmap text of the scan and its OCR version (in the table in 2.5.2 on page 314) seems to confirm your scanno suspicion. ~2026-56016-87 (talk) 15:51, 18 October 2026 (UTC)

That seems to be just a straightforward translation of the English report, which doesn't (as far as I can tell, as a non-reader of Russian) describe anything specific to Soviet ALGOL implementations. I think we'd need something like a reference manual for the specific one(s) using ю, or maybe some kind of document comparing different varieties of ALGOL, but I don't know how to find such a thing. –jacobolus (t) 18:41, 18 October 2026 (UTC)

Here is a screenshot of the relevant part from the PDF (File:Algol-number-examples.jpeg):

It's definitely '10', not a Cyryllic letter 'ю' there. --CiaPan (talk) 16:11, 19 October 2026 (UTC) (Edited 07:57, 28 October 2026 (UTC))

See also Russian Wikipedia ru:Алгол#Числа (Algol # Language properties # Data types # Numbers), which mentions the subscript '10' but no 'ю' character in the floating-point number exponential notation. --CiaPan (talk) 13:01, 20 October 2026 (UTC)

Saved edit summaries

I'm not sure if this is something my pc has decided to do, or something Wikipedia has decided to do. Edge running on Win11. Monobook (global pref). I used to be able to start typing an edit summary, and previous edit summaries that started with the same letters were offered for me to click on and use. This no longer happens in article space and Wikipedia space. It does still happen in Template space, and indeed it offers me summaries I've used in all spaces. It would be very helpful to get this happening again in article space. Any ideas? Thank you, DuncanHill (talk) 22:29, 20 October 2026 (UTC)

I can report that such suggestions are still offered to me, also for article-edit summaries. Perhaps the good people at the WP:TECHPUMP know more.  ​‑‑Lambiam 22:16, 21 October 2026 (UTC)

Floppy disk sleeves

Being older than dirt, I recall a time of not just floppy disks, but floppy floppy disks. These usually got sold with a sleeve to help protect the contents from dirt and moisture, etc. Many were simply white paper, but some were composed of something paper-like, but which had a kind of fabric within it. I think the two diskettes at the front of this image are of that type. What is it? I don't think I've ever seen it used elsewhere. It had a pleasant, soft, feel compared to plain paper. Pinging User:JIP as they are the uploader and have contributed here often. Matt Deres (talk) 00:55, 21 October 2026 (UTC)

Tyvek? —Antonissimo (talk) 02:41, 21 October 2026 (UTC)

Matt Deres (talk) 00:55, 21 October 2026 (UTC)

• I no longer have that box of floppy disks, but as far as I can remember, yes, they were floppy floppy disks, where both the actual disk (round) and the protective coating (square) are bendable and not rigid. And yes, they were sold with a protective paper sleeve, which was little else than a simple paper sleeve to put the disk into to prevent dust and dirt getting on the actual disk. JIP | Talk 06:17, 21 October 2026 (UTC)

My recollection of 5¼-inch floppies was that they came in a paper sleeve, but it had a slightly waxy texture - water resistant I suppose. Google AI says they were "typically made from heavy-duty paper, cardstock, or thin anti-static plastics like polyethylene or DuPont Tyvek," citing this page in solidarity Chuntuk (talk) 10:49, 21 October 2026 (UTC)

Many were coated to reduce static. The coating could be anything from a wax coating to a latex coating to a clay coating, depending on what was cheapest as the paper sleeve was not the product being sold. I think the issue here is that the sleeves shown in the image here are card stock. They are not the flimsy white paper sleeves with that mottled semi-gloss appearance. ~2026-46630-01 (talk) 11:15, 21 October 2026 (UTC)

No, what I'm talking about is more than a coating; the "paper" itself had fibre in it. I think Antonissimo is right and they were tyvek; an image search for tyvek floppy disk sleeve confirms it. Matt Deres (talk) 16:02, 23 October 2026 (UTC)

Tyvek is likely, but pulp paper, such as the paper used in LP sleeves, is fibrous as well. I know what you are referring to. It is like the "paper" used for money, which is actually mostly cotton. But, the shiny surface leads more towards pulp paper. It used to be called rice paper, which is a misnomer. It is made from long-fiber pulp (like mulberry). ~2026-46630-01 (talk) 16:42, 23 October 2026 (UTC)

No, it's not really like the material used for "paper" money, though it does have that softness to it. The fibers are much larger and clearly visible. Matt Deres (talk) 01:43, 24 October 2026 (UTC)

Should picture URLs include file extensions?

I've written a web application using HTML, CSS, JavaScript, Node.js and Express. I'm looking for advice on URL design for pictures in my application.

Currently, the implementation works as follows:

• backend generates SVG avatars for given IDs and converts uploaded images to WebP
• backend generates picture URLs: /avatar/{id}.svg for automatically generated avatars and /media/{id}.webp for user-uploaded images
• server.js defines the corresponding routes: /avatar/:id.svg and /media/:id.webp
• the file format is already unambiguous from the endpoint and its implementation, even without an extension: /avatar/{id} would still refer to an SVG generated by the avatar handler, while /media/{id} would refer to a WebP image served by the media handler, and the server can communicate the actual format through the HTTP Content-Type header

Would you recommend keeping file extensions in these URLs or switching to extensionless, format-independent URLs? ~2026-56849-00 (talk) 22:24, 24 October 2026 (UTC)

I'd keep the file extensions. The format may be unambiguous given the URL, but when downloaded, the disambiguating path segment is stripped off of the file name.  ​‑‑Lambiam 08:00, 27 October 2026 (UTC)