An example: rental rates displayed to users in a standard, fixed format. Some rates exist for a time period. Some do not. There could be many rows of data in this format on the page. My opinion is that in this case, lots of n/a symbols, or worse, uppercase N/A symbols look ugly, confuse the expectation of numbers, and are not immediately obvious in their meaning to a typical user.
Hour: n/a Day: $400 Weekend: $9,000
I've tried a dash, which I like:
Hour: – Day: $400 Weekend: $9,000
There don't seem to be any stylistic recommendations on the web that I can easily find. Are there any other ways to show the absence of a value that all users will understand?