Назначение «загадочной клавиши» на клавиатуре IBM PC 3270

I do know the symbol on the bottom right key as being the symbol typically used when proofreading written documents. It is a delete. When you write that over a letter or word in a paper, it indicates that it is unneeded and should be removed. Seeing as how this is an older keyboard, the users of the equipment at the time likely would be very familiar with proofreading symbols and understand what it represents.

My guess (without having used the machine in question) is that it likely is the delete key.

This page goes through a history of some IBM keyboard layouts, and a few pages down you see this image:

You can see the key layout in your screenshot above the arrow keys. The key layout is:

Dup/PA1 FM/PA2 PA3 Back Tab Insert Delete 

The delete mark on the key makes sense, especially combined with the proof-reading mark also used for "insert".

This is an IBM 6110344 keyboard and the keys on the 6110344 are laid out like this:

So the key you're looking for corresponds to scan code "6D". When we look at the related scan codes on the link given above, that key turns out to be Del, namely Delete.

The symbol you nick named as 'person in wheelchair being chased down a hill by a boulder' is for indicating that the alphabet is wrong.

Closely looking at the key we can separate the a and the other symbol .

The other symbol is indicating wrong sign.

something like we use for right & wrong . This symbol is shown in slightly different angle indicating strike off the alphabet (or delete the alphabet).

(a/°) is the DEL key. At its left is the INSERT key (â).

It does look like a proofreading notation. A letter with a bar crossing it out and a circle. Refer to delete in this page: https://people.sunyit.edu/~russ/Com310/ProofreadSymbols.pdf

That's funny, because, in Unicode, there is a symbol for insert (⎀) but I never found it used. Here, â seems really near the "insert" function (but, ô tempora ô mores, too strange for European users), so the strange symbol seems to mean "delete".

Check out the first item in this list: http://wadsworth.com/english_d/templates/student_resources/1413001890_burnett/UsageHandbook/edit_marks.htm

It's supposed to be the old fashioned delete symbol. You may remember this symbol from elementary school, but I guess most people have probably never seen it. Myself, I haven't hand-written a school paper since at least 5th grade (1997ish), so it's been quite a while.

Это клавиатура для плазменного дисплея IBM 3290 (возможно, конкретной модели - я не помню). Это ключ зума. Дисплей может быть настроен как 1 LU или 4 плиточных LU на экране. Клавиша зума увеличена в активном плиточном LU, заполняя большой экран. Нашим операторам очень понравился большой экран!

Я настроил количество 3274, чтобы работать как 4 LU. Некоторые деловые люди использовали дисплей для просмотра напечатанной страницы в 160 столбцов, 50 (?) Строк.

IIRC, верхним символом была также буква «а» - такая же, как нижний символ, но меньше. Возможно это было поцарапано. Он был предназначен для указания масштабирования!

Я никогда не видел приложение, которое использует ключ PA3!