True allergies to cow's milk are relatively uncommon. Only 2 to 3 percent of children are allergic to milk, according to the AAP, and almost all of them outgrow it by age 3. (Learn the difference between a milk allergy and lactose intolerance .).
The underscore [ _ ] (also called underline, underbar, low line, or low dash) is a character that originally appeared on the typewriter and was primarily used to underline words.
1 After starting with a letter or an underscore, the name can be made of letters, underscores, and digits in any order. 2  The name of a variable cannot have a period. 3  The name of a variable can have up to 255 characters.  The name of a variable must be unique in the area where it is used.