[FabHK]

Suboptimal. The "NOT" might be covered by something, and then what remains is "THIS LEG". I would have written "NO NO NO" on one leg, and "THIS THIS THIS" on the other.

In aviation, standard phraseology is generally carefully designed such that (mosts) subsets of a phrase are distinct from the opposite phrase. For example, when ATC warns of traffic, you reply either "traffic in sight" or "negative contact". When ATC hears only half of either, they still know what you meant.