Comment 20 for bug 452149

> the ISO No symbol is completely inappropriate for the act of deletion in any context, undoable or not, and is graphically
> inconsistent with the icon *currently* displayed for GTK_UNDELETE.

I agree

If you need an icon for something "non-undoable" other than a trash can, how about:

1. A shredder (preferably in mid-action)
2. A diagonally striked-through document (but w/o a circle)
3. A pile of shreds from a shredder
4. A document with a cross-hair overlaid
5. A dog/goat/gnu/current Ubuntu codename animal's head eating a document
6. A burning document (preferably already in half). I guess I've seen it somewhere already.
7. A smoking pile of ash
8. A ripped/torn to pieces document
9. A document being cut halfway through with scissors that have multiple blades.
10. An explosion (mushroom cloud?)
11. A burning ball of crampled-up paper
12. A torch
13. A document held over a torch, match, cigarette lighter, candle, campfire, fire
14. A campfire
15. A document/documents on a plate with a fork and knife next to it
16. An old-styled detonator you see in cowboy films in front of a document
17. A computer/monitor with a cartoon face eating the document
18. A computer/monitor with Rayman-style hands tearing the document in half
19. A document going through a meat grinder
20. A document being inserted into a blender
21. A document with a huge, smoking hole in it that covers most of its surface

And by "document" I actually mean this piece of paper with a folded corner that represents a file.

All those are more intuitive than the "No" sign.