What does ntr stand for?

Can a triangular pyramid roll stack and slide? Is tan x has fourier expansion? What does the symbol with a triangle and an arrow circling it mean with an exclamation mark in the traingle mean? Can anyone tell me what a ring marked S 11 5 with an upside down triangle and the letters TD on the inside of the triangle mean? Five lines about aryabhatta? Is the word 'rotor' a palindrome? How do you rewrite the equation -8x-5y-45? Are tornadoes bigger then hurracanes? Is a tornado smaller than a tropical cyclone? Does gynomin prevent from being pregnant if taken after three days of unsafe sex? Logx equals 0.25 what is x? How long is a wedge tornado? What is a metaphor for a hammock? Tricuspid regurgitation? What does it mean when you dream about two double rainbows? At what projection angle will the range of a projectile equal to 2 times its maximum height? What does tri mount mean for ceiling fans? What is full form of fxg? How much are oxycoten 5 mg worth? How high above sea level is houma la?