What is 39.948?

Without any additional context, 39.948 could refer to any number of things, including:

• It could be a geographic coordinate, such as latitude or longitude.
• It could be a measurement of some kind, such as the atomic mass of an element (in this case, it would likely refer to the atomic mass of yttrium).
• It could be a numerical code or identifier of some sort, such as a product code or code for a location.
• It could be a completely arbitrary number that has no particular significance.

Without more information, it is impossible to determine what 39.948 specifically refers to.