n. Z(Z形铁)

[ noun ]
the 26th letter of the Roman alphabet
<noun.communication>
the British call Z zed and the Scots call it ezed but Americans call it zeehe doesn't know A from izzard

Zed \Zed\, n. [F., probably through It. zeta, fr. L. zeta. See
{Zeta}.]
The letter {Z}; -- called also {zee}, and formerly {izzard}.
``Zed, thou unnecessary letter!'' --Shak.