Definition: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
Input: Question: I came upon this letter when reading a book, I couldn't find its name on the internet, you can imagine how hard it is to search about it. What is the name of the letter that follows "sample space"? I know it's not really an English question, but I think this site is best fit for the question than say, the mathematics site. 
Answer: It's an S written in a fraktur font used by mathematicians. This one is easy to find out using Detexify.

yes