Sets user defined values for Metric Prefix characters.
Setting the format attribute to "mp" formats numbers with "metric prefix".To format 1,234,567 as "$1.23M", use Format "$#.00mp". Supported metric prefixes are from 1000^6 to 1000^-6
The default string of characters from 1000^-6 to 1000^6 is "a,f,p,n,µ,m,k,M,G,T,P,E". You can replace this string with a comma separated string of characters that would represent this format.