Letters that make 366 days
s, a, d, y, 3, 6 are letters that make '366 days'
1 possible definitions for '366 days'
Under this definition, 366 days is a noun and has the following properties:
leap year, intercalary year, bissextile year have the same meaning as '366 days'
'366 days' can be a type of year, twelvemonth, yr.