What is the meaning of Gnomon?

An object such as a pillar or a rod that is used to tell time by the shadow it casts when the sun shines on it, especially the pointer on a sundial.

An object such as a pillar used by an observer to calculate the meridian altitude of the sun (that is, the altitude of the sun when it reaches the observer's meridian), for the purpose of determining the observer's latitude.

The index of the hour circle of a globe.

A plane figure formed by removing a parallelogram from a corner of a larger parallelogram.

A number representing the increment between two figurate numbers (numbers equal to the numbers of dots in geometric figures formed of dots).

gnomon

accusative singular of gnomo

gnomon

gnomon; rod or pillar on a sundial whose shadow is used to indicate the time

gnomon

gnomon

gnomon

Source: wiktionary.org