Just by itself the most common meaning for 三 would be the number 3, but as the suffix 山, it means mountain.
Then of course there is the common suffix at the end of a persons name.
san is almost like mr./ ms/ mrs etc
its very polite and neutral so you can use it for any age, gender... etc
basically you add it after a persons name
ex. Mike san
in Japanese they don't use he or her as often as English does so instead they will say the persons name and add san to it.
there are other particles like san but they are based off of gender and age
"San gatsu" is a Japanese word and in English it means "March"
"juu san" is a Japanese word and in English it means "thirteen"
San
Hitoshi-san
'(o)kyaku(san).'
"Granny", which is the same as "old person" in Japanese is pronounced Ba-San. (baa-san) !
Mr/Mrs/Miss/Ms.
Saint.
Elder or old person is pronounced Ba-San.
mei If addressing some one or talking about someone else's family, add -san at the end (mei-san).
Minna. To politely address everyone, it becomes "Mina-san."
When you are talking about someone else's aunt it is Oba-san. But if you are talking about your own aunt it is Oba.