Answers
ml, Mm,cg
m, little m, is milli and means 1/1000 of anything
M, capital M, means Million
c, little c, is centi and means 1/100
l, little l, means liter (although I see capital L used mostly when referring to a stand alone Liter or MegaLiter, ML)
m, little m, means meter also (such as in mm, millimeter, first m is milli and second m is meter)
g, little g, means gram