A heliograph is a device that uses the reflection of sunlight to send signals or messages over long distances. It typically consists of a mirror mounted on a tripod, which can be adjusted to reflect sunlight in a specific direction. By tilting or rotating the mirror, different flashes of light can be produced, allowing for a coded system of communication. The combination of a helicopter emoji 🚁 and a sun emoji ☀️ suggests the use of a heliograph from an aerial perspective, where a helicopter could potentially serve as a platform for operating the device and transmitting signals using sunlight.