Absolutely not!
I have never heard of 3 inch, but I would assume it refers to the spacing of the hot and cold lines. Standard in the U.S. is 4 inch center to center.
A two inch by 3 inch LCD is commong,but by no means standard.
The standard diameter of an inch and a quarter copper pipe is 1.25 inches.
one inch
1 inch = 2.54 centimetres.
The standard wheel size is a 16 inch wheels. There are options available for larger wheels, such as a 17 inch, 20 inch, and 22 inch wheels.
36 x 36 inch is standard.
standard rates of pipe fabrication per inch dia
The standard thread size for a tripod is usually 1/4 inch or 3/8 inch.
The standard size of a bicycle chain is 1/2 inch pitch with a width of either 3/32 inch or 1/8 inch.
The standard measurement for high resolution in terms of pixels per inch is typically 300 pixels per inch.
Standard drill bit sizes in inches typically range from 1/16 inch to 1 inch, increasing in 1/64 inch increments.