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7 mm is about a quarter inch and 3 mm about an eighth of an inch.
The USA 25 cents (quarter) coin is ø 24.26 mm
The diameter of a quarter is 24.26 mm. Circumference is pi* diameter. 24.26 mm * 3.14159=76.21 mm
There is no specific name. A quarter of a mm could also be known as 250 micrometres and so on.
A quarter of a sheet of A4 paper is 52 mm by 74.25 mm (about 5 x 7.5 cm). A4 dimensions are 210 × 297 mm (about 8.3 × 11.7 inches, comparable to US letter size 8.5 x 11)