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and all over google.
Hope I don't get egg on my face.
Benjamin Outram United Kingdom Local time: 19:54 Native speaker of: English
Notes to answerer
Asker: Thanks for the assistance. I searched at www.iso.org and techstreet.com and didn't come up with anything for this term. Google only has 58 hits altogether (not that that means is definitely wrong of course).
26 mins confidence: peer agreement (net): +1
spline socket head
Explanation: Unfortunately, I can't find any decent drawings or pictures of spline wrenches or spline socket head screws, but see