http://www.signsofthemountains.com/what-do-the-symbols-on-ski-trail-signs-mean-d/ http://news.outdoortechnology.com/2015/02/04/ski-slope-rating-symbols-mean-really-mean/
Looks like a green circle is the symbol for a beginner slope. (The first link also shows that "piste" is the European word for what we call a trail, run, or slope). There is no difference between a "bunny slope" and a "beginner" or "novice" slope. Unicode has some suitable filled circles (particularly U+2B24 and U+25CF), and it has a green apple, heart, and book, but as yet no green circle. -- Doug Ewell | http://ewellic.org | Thornton, CO 🇺🇸
