Sorry if this is too trivial:
I need an actual working definition of the term: Hopf band. I see references to it
in many searches, but never an actual precise definition. All I know so far is that it
is a Seifert surface for the Hopf link ( the disjoint union of two unknots $S^1$) , but this obviously
does not narrow things enough to an actual definition, since there is more than one
Seifert surface for every unknot. I've spent around an hour looking for a precise working definition.
How do people actually find these definitions?
EDIT: I found a "definition" ( a picture, aka, 1000 words ) in page 135 of: http://books.google.com/books?id=mbXi8kC7DIMC&pg=PA134&dq=hopf+band&hl=en&sa=X&ei=GydsU8YR6sewBPOpgYgG&ved=0CDkQ6AEwAg#v=onepage&q=hopf%20band&f=false
I did not know one could do a search over all books. I'll try to remember that.