I was going to ask whether you play the violin. When you mentioned things like col legno, etc. I thought perhaps you did, but the examples themselves, in the context, also made me think you didn't and had perhaps looked up types of bow strokes. Your newer post gives some clues that might lead to an answer. I've highlighted the key word:
I've listened to countless of recording, and none of them sound like strokes of violin to me....
Here is what you quoted (I think you were quoting Chopin?)
I heard about "If you learn it according to my instructions it will expand your hand and enable you to perform arpeggios like strokes of the [violin] bow."
In my understanding, he is talking about the human hand; the actions of the hand and arm - not the sound being produced.
I studied violin for a few years, got into trouble and stopped, and have made a start at resuming. The bow hand and arm of a good violinist is constantly morphing its shape like an amoeba .... or jellyfish:
or this swimming octopus
I don't know if it can be seen in violin if you're just watching: not just the hand but the whole arm moving in a fluid way.
=30
Maybe it's more visible with a cello
=350
I'm a piano student who started the wrong way as a child self-teaching, picked up piano again decades later, and am un/relearning how to move. We have used some Chopin etudes at slow tempo, and sometimes just parts, to reeducate movement (technique). As I understand it, Chopin himself was trying to influence (change?) how his students moved at the piano. To play pieces like Op. 10 No. 1 at any tempo that is not a snail's pace, esp. if you have a smaller hand, the shape and angle of your hand is changing continually, and most work in smooth coordination with the entire hand and arm complex. Since you're going up and down octaves, the body has to move too. This is like the jellyfish, octopus, and the strings players.
The quote makes instant sense to someone who plays a bowed string instrument, or is learning to do so - but probably less so to someone who is only listening for the sound. I believe this is about motion and coordination, not any particular sound.