Discuss PGroot's answer to: What does the symbol x mean?

x in algebra often stands for an unknown quantity, such as 2x+3=7.

x and y coordinates are used to describe equations.

When placed between two numbers like 2 x 4 it often means to multiply. 

In carpentry 2 x 4 refers to a piece of wood that (before drying) measures 2" by 4".  After drying it measures 1 5/8 by 3 5/8.

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