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As you probably know, Sage is built on top of Python, but then it extends Python's syntax. If you're not sure what some non-Python thing does, use the preparse command:
sage: preparse("ratpoly.<t> = PolynomialRing(QQ)")
"ratpoly = PolynomialRing(QQ, names=('t',)); (t,) = ratpoly._first_ngens(1)"
So ratpoly.<t> = PolynomialRing(QQ) creates a polynomial ring with coefficients in the rationals (QQ). The ring itself is called ratpoly, and the generator is called t.
