"Noting" can have several different meanings depending on the context. Here are a few possible definitions:
To make a brief written record of something for future reference. For example, if you are attending a meeting, you might take notes to remember what was discussed.
To observe or pay attention to something. For example, if you notice that your friend seems sad, you might make a mental note to check in with them later.
To acknowledge or recognize something. For example, if someone thanks you for your help, you might say "noted" to indicate that you heard and understood their gratitude.
In music, "noting" refers to the act of writing down musical notation or symbols to represent a piece of music.
