  We study the elliptic double-box integral, which contributes to generic
massless QFTs and is the only contribution to a particular 10-point scattering
amplitude in N=4 SYM theory. Based on a Feynman parametrization, we express
this integral in terms of elliptic polylogarithms. We then study its symbol,
finding a rich structure and remarkable similarity with the non-elliptic case.
In particular, the first entry of the symbol is expressible in terms of
logarithms of dual-conformal cross-ratios, and elliptic letters only occur in
the last two entries. Moreover, the symbol makes manifest a differential
equation relating the double-box integral to a 6D hexagon integral, suggesting
that it can be bootstrapped based on the latter integral alone.
