How to Deal with Abbreviations at the End of a Question – Punctuation Tips

I hope that these references help you see how some other authorities handle the abbreviation for "etcetera".

"The Chicago Manual of Style", the Australian Government's "Style Manual for Authors, Editors and Printers", and "Fowler's Modern English Usage", all highly regarded and of long standing, all invariably use a period after etc. and they also have suggestions about commas with "etc".

1). A comma is not required, as commas are normally used when separating two sentences spoken by one or more characters.

2). When expressing what a sign or other normally non-punctuated set of words, a stop being inside the expression is not strictly required or frowned upon, though many people prefer the stop to be outside if the sentence is very short