Each field matters. For instance, “WP” tells a layout engineer the exact package dimensions—48-pin TSOP I vs. 63-ball BGA. The “IT” ensures that an industrial router will not fail in a hot factory.
If you are looking at a physical chip, you will likely see a 5-digit alphanumeric code (e.g., "D9VPP") rather than a full part number. micron memory part number decoder