Yup ! What are the symptoms or signs that woman has no boyfriend ?

I sure hope english is not your first language.... symptoms, you make is sound like an desease.

That being said, there is no real 'single' trait. Heck even women with wedding ring on their finger are single sometimes. As a rule of thumb single women might look around more, especially in bar/club situation. Look at guys. They might make and maintain eye contact with you. In day game, there will be almost nothing to pick up. So regardless of day/night just engage, especially if you get eye contact. If she is interested take it as she is single untill she mentions the boyfriend. If that happens, then you either keep on pushing or pull out depending on what you like doing. Some still pursue and treat this as a shit test (maybe she is single but is finding you boring), some respect it (maybe she is really in a relationship) and move to find a single target. I'm not going to suggest one way or another that's your call.

_________________
Drink me, make me feel real
Wet your beak in the stream
Game we're playing is life
Love is a two way dream

attached women tend to huddle together while single women will isolate.

sinle women will also do what is known as the tap where there arms are crossed and there exposed finger will be tapping there upper arm.

Theres a ton more in the ebook "the body language project".

http://bodylanguageproject.com/

with a search engine search u may be able to get it for free but its worth the money let me tell you.

You have two options. At some point early in conversation you can ask "Hey, are you single?" which I like because it shows your intentions and interest early on. Or you can never ask, sort of brush it off if she mentions a significant other. Some girls are okay with cheating or lie about being taken. If you're okay with participating in cheating, then it won't matter if she's single or not.

are you looking for a wife or a long term relationship? if not don't bother. some women say they are single if asked, don't take that word! you'd rather trust your brake than women