Did you know that different types of lines have different names? A vertical line goes up and down. A horizontal line goes left to right. Why not have a look around and see if you can find any ...

The number of rows, dots or lines from top to bottom on a printed page, display screen or fixed area such as one inch. Contrast with "horizontal resolution," which is the number of elements ...

They all have vertical symmetry. This means you can draw a mirror line down through the middle of each shape and divide it into two reflected halves. Remember vertical means from top to bottom.