Что означает Head в конце письма в английском языке ?Dear parents,School

Что означает Head в конце письма в британском языке ?
Dear parents,
School visit to London for classes 3A and 3B.
Mr.Grey (History teacher) is taking his classes on a school visit to the Natural History Museum in London on Thursday, 10th April.
Everybody must please:
--- be at school at 8 ,
--- wear their school uniform and comfortable shoes ,
--- bring a raincoat, a packed lunch, an exercise book and a pencil.
We shell come back at 5 in the evening. this visit is very important and we hope that all the children will go.
Yours sincerely
Marion Hailey
Head(Что это означает и как переводится)