Syntax: .global <node1> [node2 [node3] [...]]
Example: .global VDD VCC
The .global command allows you to declare that certain nodes mentioned in subcircuits are not local to subcircuit but are absolute global nodes.
Note that global circuit common is node "0" and that a .global statement is not required. Also, node names that of the form "$G_" are also global nodes without being declared in a .global statement.