I am curious about whether I should end non-sentences (or very elliptical sentences, if you will) with a period.
For example, I am writing some documentation for some computer code. In this usually I include code like
argument_description="Echo times for each input file". Often the user sees this formatted as
ARGUMENT — Echo times for each input file
Some other times I might be writing descriptions for software packages, then my text might appear to the user as:
Description: PAW atomic data generator
Also, on occasion, I might print out a sign for the office saying
Christian's agarose gel, 1.2%
Up until now I have stuck with no periods ever unless it is a full sentence, or part of a longer text. I am more liberal with question and/or an exclamation marks, as they also serve to better carry a more emotional meaning.
But I am thinking there might be some exceptions where a period is needed regardless. Perhaps even among the examples above?