The symbols were recently updated but it's impossible to know their meaning unless you read bug 144661...
Created attachment 95799 [details] /tmp/emerge.1.patch Patch for man emerge based on commenst in bug 144661.
Created attachment 95808 [details, diff] brief description of symbols I've committed this brief description of the symbols in svn r4381. Do you think that will be enough? I'm not sure if it's really necessary to list all the possible combinations. Note that the list of combinations from bug 144661 doesn't include forced flags (the opposite of masked).
Created attachment 95809 [details, diff] brief description of symbols Here's the correct attachment.
Yeah that should be enough, certainly better than now :)
This has been released in 2.1.1_rc1-r3.
Please consider explicitly documenting all the combinations of annotations given in comment #7 of bug 144661, not just the basics. I find it confusing for instance that the parenthesis () take on different meanings depending on context.