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I renamed, as suggested by bugcat
However, this naming has been there all along. And while 3-3 is clearly an invasion to a 4-4, when it's in relation to the 3-5 or 4-5 it may be seen like an approach
What do the experts think?
Do we have a precedent in published material for using "invasion" or "approach"?
To me, it seems that if the 3-3 under 4-4 is an invasion then so is the 3-3 under 5-4, or even 5-3. But that's clearly a subjective opinion.