This symbol is a Greek letter called (capital) sigma. It's used to denote sums.
The Greek lowercase epsilon ε , the lunate epsilon symbol ϵ , or the Latin lowercase epsilon ɛ (see above) is used in a variety of places: In engineering mechanics, strain calculations ϵ = increase of length / original length.
In statistics, the symbol e is a mathematical constant approximately equal to 2.71828183. 2.3e-5, means 2.3 times ten to the minus five power, or 0.000023. 4.5e6 means 4.5 times ten to the sixth power, or 4500000 which is the same as 4,500,000.
energyE = energy. Ek = kinetic energy.
During the first few weeks: 1 to 3 ounces of formula every three to four hours (this will probably be closer to 2 to 3 ounces a feeding after the first few days or week). Wake your baby for a feeding if he sleeps longer than five hours. By the first month: At least 4 ounces every four hours.
3 round burst is (pretty) useless because it is neither fish nor fowl. It's based on the idea that the soldiers lack discipline or training to be allowed to have full auto.