Drogue and Visual signal

Drogue noun - A truncated cloth cone mounted on a mast; used (e.g., at airports) to show the direction of the wind.

Visual signal and drogue are semantically related. In some cases you can use "Visual signal" instead a noun "Drogue".

Visual signal noun - A signal that involves visual communication.

Drogue and visual signal are semantically related. Sometimes you can replace term "Drogue" with "Visual signal", this terms are similar.