I wouldn't put this on my resume, but if you're on an interview, I'd mention it as a "transitional role" you've taken on while you're looking for something more permanent.
3 months isn't a long time at a job either - 2-10 years is an ideal time span that's reputable for most companies to bring you on as a reliable worker.
If a potential employer has been asking you what you've been doing, you can say you've been trying different industries to find the fight professional fit or company culture.
You didn't mention you had any other jobs for a while other than the one you had for 3 months. If you didn't work at all before this, you need to express that maybe you were in school, maybe you were, again, seeking a good professional fit or you were examining your options on what type of position would be best for you.
There are lots of "safe phrases" you can say on an interview, but you need to be able to justify your professional history - if you were in school before this, that's the best reason to have just started working and seeking employment.