I would like to suggest these icons:
1) A horizontal line
2) A vertical line
5) Globe (to symbolize the Web)
For a horizontal line (or vertical) use a rectangle - with a width of 2 to 4 pixel (or something)
There are undo/redo controls on the top right of the (browser based) interface
Thanks for the providing the workaround in regards to the line icons I requested. That will work!
As for Undo and Redo, are you suggesting I can use these as icons in an app? If yes, how?
My mistake - was just reading that as needing and undo/redo feature in the designer!
Right - had a bit of a play and some Googling (though perhaps I should be politic and say Binging here)
Have a read of this article https://docs.microsoft.com/en-gb/powerapps/maker/canvas-apps/add-images-pictures-audio-video
Basically in a nutshell - upload your icon as a media file
Insert it as a media item (from the Media dropdown) you just need to name the image property as the filename (without the suffix)
Then use the OnSelect or any other function as normal....
Although I would still like these to be standard icons available from the icons dropdown, I am appreciating your thoughtful replies.
I did read a mention about the "cook your own icon" method but it said the results were not as clean or clear looking as using the already available icons, so I have not tried it. I may give it a whirl.