On deck he had overborne my stubborn perplexity by dint of a forced though forceful joviality; in his cabin the gloves were off. View in context Underneath was a man of iron, square-jawed, nervous, forceful.
Delta is a letter of the Greek alphabet with several different mathematical meanings. Learn about the functions of delta, what it looks like, and how you can use delta in your mathematical expressions in this lesson.oth meanings being with the letter D just like the Greek letter, which should help you remember them: 1  Difference is the most common meaning of the uppercase delta. 2  Discriminant is the second most common meaning of the uppercase delta.
The (Sigma sign) is the 18th letter in the Greek alphabet. Mathematically, Sigma is a summation notation which basically means âsum it upâ. This math symbol was first used by Leonhard Euler, a Swiss mathematician, in representing the addition of a series of mathematical expressions. Golden Ratio Another popular math symbol is the Golden Ratio which is also called the divine proportion or golden section or golden mean.