Library Etiquette: There is very little. Single students need to stop taking up entire large tables. It’s hard enough finding a table for 2+ people some days (many days). 1 student + huge table=rude. Maybe post a sign about it maybe?
I too have considered signage to address this problem, but recent experience with library thefts, and signage’s inability to address the problem, convinces me that such a measure would be useless at best. This is sad, as I love creating signs. It’s just that people don’t read them.
So if you need space at a table, there is no danger in asking for it. Our patrons are generally a hardworking but pleasant group (laptop thieves excepted).