What on the ruler indicates the starting point?

The things that indicate the starting point on the ruler are introduced as follows:

The starting point of the ruler is indicated by 0.

The 0 on the ruler indicates the specific position of a point, which is the starting point for marking the length number on the ruler.

When measuring, first aim the ruler at the measured object and then read it. Marks engraved or painted on measuring tools and instruments are used to indicate the magnitude of numerical values and the general names of these marks. "Snake ruler" is a ruler specially used to draw curves. Triangular ruler is a ruler of right triangle or isosceles triangle, which is convenient for drawing parallel lines or vertical lines. Slide rule: a calculating tool.

Soft rulers are often used to measure human parts. Ruler: used to measure buildings, furniture, etc. Vernier caliper: used to measure smaller things. In ruler drawing, ruler is regarded as a tool for drawing infinite straight lines.

Extended data

One of Lu Ban's inventions is that he can correctly draw a right triangle, also called a class ruler, and can tell craftsmen which sizes are irregular and which ones are unlucky according to the rules of divination (geomantic omen). These rulers were bought today. Silk cloth ruler, also known as tailor ruler or cutting ruler, originated from the ruler with class ruler, but it has not been passed down from generation to generation, and has long lost its standard and become another ruler system.

The most taboo of ruler is scratching and blurring the carved values, so ruler has become the most precious item in stationery. Rulers should not be mixed with knives or metal stationery, and must be covered with pens when mixed with pens. Be sure to prevent exposure to the sun and prolonged exposure to the sun, especially the plastic ruler has poor temperature resistance and will be deformed.