The pencil represents “draw mode” With draw mode activated, you can draw on any surface. This is an experimental feature and I am currently working on modifying the way line entities work to make them more efficient- right now you can only specify two points per line, meaning that if you want to draw curves and other detailed drawings, you need to create a bunch of tiny little lines, that are culled out by the LOD system. OR you have to create fewer, longer lines, meaning you loose accuracy of what you want to express. I’m changing line entity to be able to take an array of up to ~100 points (cannot take many more because each property can only be an MTU, or maximum transmission unit, which is about 1500 bytes.)
The other icon is a laser pointer, which represents the pointer. If it’s deactivated, your pointer will not show up when you point and left click on entities. If it’s deactivated, you cannot draw either. (But you can have a pointer active and not your drawing capabilities.) I’m sorry if the icon wasn’t clear-
Please feel free to peruse https://thenounproject.com/, which has a lot of great choices. If you find one you like better, post it here and I’ll switch it up! If there’s a lot of posts we can vote!