What is the number about 4 cm high and 3 cm wide?

And the font size used in engineering drawings (such as CAD, marks, etc.). ) Is it 2.5? 3.5? 5? 12? Equal font size directly refers to the height of the font, and the font width is 2/3 of the height.

Therefore: No.5-5 mm high and 2/3 * 5 = 3.3 mm wide.

For example: mark Times New Roman Font No.3.5;

Namely; The word is 3.5 mm high and 2.3 mm wide.