What Do The Following Symbols Traditionally Represent In Art History?

The clock as the passing of time is an obvious one, but it can also have extra meaning within that; such as the mechanistic way of life, the struggle to control time and the domination of time over the conciousness of industrial society.

The answer "The spiritual and divine" suggests that the stars are associated with spirituality and divinity. This could be because throughout history, many cultures have believed that the stars hold a special significance and are connected to higher powers or deities. The stars are often seen as symbols of guidance, enlightenment, and transcendence, which are all aspects of spirituality and divinity.

An open book can symbolise the sharing of knowledge and scholarship.
It can be a symbol of power, as it can only share knowledge with the initiated;- those who can read!

A closed book can symbolise the futility of knowledge, or hidden knowledge that is not available.

The sun can be seen in many ways, depending on where it is shown in the sky. When the sun is rising or fully risen it symbolises themes such as power, life, enlightenment, strength and will.
A setting sun can symbolise death and rebirth, as it always returns.

In Ancient Greece dolphins were linked with Apollo and his gifts of wisdom and prophecy.
They symbolise a unity between Apollo and Aphrodite, between masculine and feminine.

The house can be a symbol of self, and the way it is depicted can symbolise aspects of the artists personality or attitude.

All four! 3 is considered to be an important number in many cultures; symbolising birth, life and death, past, present and future, and mind, body and soul across cultures.
It also represents Heaven, Earth and humanity in Chinese culture and the Holy Trinity; the Father, Son and Holy Spirit in Christianity
The number three can be presented in many ways, including the actual symbol "3", the inclusion of three repeated objects or elements, or as a triangle.