Un sweat or un sweatshirt is a borrowed word from English and means the same.
a sweat shirt
j'amie vorte pull
un sweat (but it's pronounced 'sweet')
un sweat rayé (sweat is pronounced sweet)
a jumper is called "un pull / un pullover / un sweat" in French
A hoodie (hooded sweat-shirt) is called "un sweat à capuche" in French.
A sweater is called "un sweat" (masc.) or "un pull" (masc.) in French.
a jumper (clothes) is called 'un pull' (masc.) or 'un sweat-shirt (masc.) in French
I've taken several French classes and I was born in France. I think its masculine. Hope this helped. :)
Sweat: means soldering.
I hope you mean 'What do the initials 'UN' mean - United Nations.
un tabier doesn't mean anything, un tablier means un apron