Transforming ideas, thoughts and messages into verbal and non-verbal signs and symbols is known as

Turning ideas and messages into verbal and non-verbal signs is called encoding.

Encoding is the sender's act of converting a thought into a transmittable form of words, gestures or symbols.

Once encoded, the message can travel through a channel toward the receiver.

Channelisation names only the routing through a medium, not the making of signs from thought.

Controlled communication describes managed or restricted exchange, a quite different idea from sign-making.

Decoding is the reverse act, where the receiver turns received signs back into meaning.