4-4-4-4. The Baltimore & Ohio Railroad 's #5600 George H. Emerson. A 4-4-4-4 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, has a four-wheel leading truck, two sets of four driving wheels, and a four-wheel trailing truck. While it would be possible to make an articulated locomotive of this arrangement, the ...

Number 4 is the number of the square. Number 4 symbolizes building a strong foundation. There are four cardinal points: North – South – East – West. There are four winds. There are four phases of the moon. There are four seasons. In the West we have four elements: earth – air – …

Four definition is - a number that is one more than three. How to use four in a sentence.

Chroma subsampling is the practice of encoding images by implementing less resolution for chroma information than for luma information, taking advantage of the human visual system's lower acuity for color differences than for luminance.. It is used in many video encoding schemes – both analog and digital – and also in JPEG encoding.

This is "Year 6 - Week 12 - Lesson 4 - The mean" by White Rose Maths on Vimeo, the home for high quality videos and the people who love them.