This looks like the start of a simple text-based data format.
"SIMPLE.TEMPERATURE" might be a key or a label for the data that follows.
"1" is the value associated with that key.
What kind of context are you working with? Knowing the context would help me give you a more precise explanation. For example, is this from:
- A configuration file?
- A simple data exchange format?
- A programming language snippet?
- A game data file?
Without more information, I can only tell you that it's likely a declaration of a temperature value.