Programmers often use a three-letter code in front of the object being built in a program. What is this code known as?

What is the algorithm for building a binary tree program

Which demographic challenge is europe currently experiencing? a. an aging and decreasing population b. a baby boomc. an unequal distribution between males and females d. a large group of teenagers moving through the school system(i chose a but i'm unsure)

The first screen you see when you open word2016 what is called?