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it would be nice if
You could choose different icons for particular bones.
IK icon is easy to see, and to kick. But sometimes we have more specific bones, which we use in code for locations, whether it is emitter or something else.
It would be nice if there was a list of primitive shapes which you could select to change the appearance of the bone (only if the length is 0?)
Changing the colour helps a little, but not much
We'll add this.
If you have ideas for icons please list them in this thread. We can't add everything but will try and have a good balanced amount.
I personally think simple sapes would be enough (square circle triangle, diamond, my avatar), but it would be nice to have a triangle orientated like: <| (when a bone rotation is 0) . I think this would be usful for emitters which emit in the direction of the bone
Icon ideas:
sword/bullet/arrow (some icons for weapon placement or projectile origin)
maybe sparkles for effects/particle targets - (like this one but solid: https://thenounproject.com/term/sparkle/195498/)
hand (for bones that serve as handles, especially where the users use systems of bone weights.... but maybe also just for hand bones. diamonds could serve the same purpose, i guess though it's more ambiguous. maybe some other thing that looks like it should be handled.)
These icons don't show up in the viewport though, so maybe they're not that useful.
I'm working on a selection of icons that show up in both the tree and viewport. So keep the suggestions coming.
6달 후
We've done this in 3.5.07-beta, which will be available in a few minutes. :happy: There are only a few icons right now, but Shiu is working on adding more.
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Do the icons rotate with the bone?
Yep! Go try it! 
Great!!! I wonder how they transform with length of bone/scale
The icons are only for length == 0 bones. If length > 0 they show up as bones normally do (either solid or, if constrained, hollow). If you set an icon it changes the length to 0 for you. If you then increase the length, it will look like a bone in the viewport, but you'll still get the icon in the tree.
Love this. Simple and easy to reuse.
I would also propose a 'special' label icon that displays the bone's name in a rounded-corners rectangle, like shows up now when you name the bone and toggle bone labels on - but this would allow you to hand-pick which bones to show their names instead of seeing them all.
Names are an interesting idea. Might make more sense as a checkbox, and could be for attachments, paths, etc. I wonder if the all names option we currently have is sufficient though? It hides names that don't fit, so you can zoom in/out to get more/less names.
Full character view
The Zoom level required to see the bone I want to see while setting up combat.
Finally, the blue bones are the ones whose names I care about seeing at a glance. (Several not included because I couldn't find any easy way to show/select them)
Tell me, Nate, what do you think? 
Hmm. Seems a name checkbox could be useful. An alternative would be to give the bones you care about a distinct icon. I guess it may not be descriptive enough to use only icons in a very complicated rig. Also when the function of bone isn't clear by its position or is near other bones, an icon is less useful.
Thank you, Nate
Noted bug:
If you pick an icon for a bone with a length, then try to switch back to 'Bone' (top left) - it will no longer respect the 'size' field of the bone.
Bones don't have a size field.
Icons are only for bones with 0 length. When you choose any icon except for the bone icon in the upper left, the length is set to 0. If you then set the length > 0, the bone will appear like the bone icon in the viewport, but you'll still get the icon in the tree. If you choose the bone icon, the length is set to 100.
bcats dreams have come true.
Is there any reason to not store the length of the bone and simply ignore it and render the icon at size 0?
Pharan wrote
Hilarious charicature of the American voter, Pharan
Length means something for IK and path constraints. I think if a bone has a length, you should be able to set it.
Genius, Pharan! :drunk: