Has there been any discussion about making some kind of m_legs or m-shaped_legs tags before? I'm referring to the Pixiv equivalent of M字開脚 which is currently linked to the spread legs wiki. M legs (or M-shaped legs) would refer to spread legs where the knees are bent so that the shape of the legs resembles an M (post #3753487, post #3758199). Of course there would have to be guidelines since things like cropping and image perspective would affect how the legs are shown.
I had been considering suggesting a v_legs/v-shaped_legs tag (V字開脚, but it looks like folded (and by extension piledriver) covers that already. It would have referred to such an extreme fold of the person's body that the legs would look like a V (post #3713837, post #1308676), but with those existing tags, I felt it would be redundant to describe the shape of the legs as well.
I'm just wondering since there are letters associated with other body parts like V arms, X arms, W arms, X fingers and V (peace sign). V-shaped legs are dubious to me, but I think M-shaped legs has some validity since spread legs has so many posts. What do you guys think?