Shannon

The shan­non (Sh) is a unit of in­for­ma­tion. One shan­non is the differ­ence in en­tropy be­tween a prob­a­bil­ity dis­tri­bu­tion on a bi­nary vari­able that as­signs 50% to each value, and one that as­signs 100% to one of the two val­ues.