en.wikipedia.org/wiki/Horizontal_and_vertical

The usage of the inter-related terms **horizontal** and **vertical** as well as their
symmetries and asymmetries vary with ...

en.wikipedia.org/wiki/Vertical%E2%80%93horizontal_illusion

The **vertical**–horizontal illusion is the tendency for observers to overestimate the
length of a **vertical** line relative to a **horizontal line** of the same length. ... Cross-
cultural differences in susceptibility to the **vertical**–horizontal illusion have been
noted. ... from hemispheric asymmetries, and/or biological **differences between**
men's ...

www.reference.com/math/difference-between-vertical-horizontal-lines-9e8e73a2eba24c24

**Horizontal lines** are parallel to the horizon or parallel to level ground. They have
a slope of zero and are parallel to the x-axis on a graph. **Vertical** lines are ...

www.coolmath.com/algebra/08-lines/08-graphing-horizontal-vertical-lines-01

**Horizontal** and **Vertical Lines**. What if we want to graph this? y = -2. Hmm... It
doesn't look like there's enough there! Where's the x? We're used to these: Ax +
By ...

www.floridaearlylearning.com/sites/www/Uploads/files/Oel%20Resources/Sample%20Lessons/DiagonalHorizontalVerticalLessonPlan.pdf

The child will understand and tell the **difference between** the orientation terms (
e.g., diagonal ... pictures of objects with a diagonal, **horizontal**, and **vertical**
orientation. Targeted ... stand up straight and **vertical** and then **line** up at the back
door.”.

www.montereyinstitute.org/courses/Algebra1/COURSE_TEXT_RESOURCE/U04_L1_T1_text_final.html

In math, slope is the ratio of the **vertical and horizontal** changes **between** two
points ... change divided by the **horizontal** change **between** two points on a **line**.
... The run **between** these two points is the **difference** in the x-coordinates, or x2 −
x1.

math.stackexchange.com/questions/836969/difference-between-horizontal-and-vertical-line-tests

Jun 17, 2014 **...** The **vertical** line test is to check if a curve is a function. ... and the **horizontal line**
test checks whether the inverse of that curve is a function.