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If we used the names from inspect.Parameter.kind (https://docs.python.org/3/library/inspect.html#inspect.Parameter.kind) these would become:
* BUILD_VAR_POSITIONAL
* BUILD_VAR_KEYWORD
which would be 20 and 17 letters long, respectively.
I think that would also make the disassembled bytecode more self-explanatory:
>>> dis.dis('f(a, b, *args, x=x, y=y, **kw)')
 1 0 LOAD_NAME 0 (f)
 2 LOAD_NAME 1 (a)
 4 LOAD_NAME 2 (b)
 6 BUILD_TUPLE 2
 8 LOAD_NAME 3 (args)
 10 BUILD_VAR_POSITIONAL 2
 12 LOAD_NAME 4 (x)
 14 LOAD_NAME 5 (y)
 16 LOAD_CONST 0 (('x', 'y'))
 18 BUILD_CONST_KEY_MAP 2
 20 LOAD_NAME 6 (kw)
 22 BUILD_VAR_KEYWORD 2
 24 CALL_FUNCTION_EX 1
 26 RETURN_VALUE