Symbol [Section(s)] T [3.2.2] I [3.2.2] O [3.2.2] B [3.3.1] H [3.3.1] D [3.3.1] D [3.3.2] Meaning [Section(s)] Transaction [3.1,3.2] Transaction input [3.2.2] Transaction output [3.2.2] Transaction block [3.3] Block header [3.3.1] Digest [3.2.1] Root hash (aka...