CuZn10 has a zinc content of ten percent, making it a copper-brass alloy. CuSn6, on the other hand, is a copper-tin alloy with six percent tin. An architectural bronze, or CuZn40Mn2, contains copper as well as 40 parts zinc and two parts manganese.
The same naming convention applies to other alloys. CuNi10Fe1Mn, a typically sea-water corrosion resistant alloy, contains 10% nickel, 1% iron, and some manganese (despite being less less than 1%, manganese is an important element and therefore listed in the formula).
Only the pure copper grades have their own name such as Cu-DHP (copper for plumbing pipes) or Cu-ETP (copper for power cables), and are not included in this classification.