1, vertical to the left, from top to bottom.

2. The middle is oblique, from upper left to lower right.

3, right vertical, top-down.

N, N is the 1 4th letter in the Latin alphabet, and N means a lot in algebra, such as from1to 2, to 3, ..., to N. Therefore, in spoken English, N is often used to mean many things, such as "I bought more than N phone cards" and "I only met him once and got acquainted with him".

Capital letters represent

1. In mathematics, n stands for natural number set (nonnegative integer set). N* stands for a set of positive integers.

2.n stands for the neutral line in alternating current.

3.n is on the map, pointing north.

During the train travel in China, the express train represents the passengers in the pipeline.

5, n In physics, the unit of force is Newton, abbreviated as cow, and represented by the symbol n.

6.n stands for knight in chess, because its initials are the same as those of the king, which is easy to be confused. ?