The symbol A950 to the north-east of IREWA is most likely a trigonometrical station.
Trigonometrical stations, also known as triangulation stations, are landmarks used in surveying and mapping to establish the exact location and elevation of a point on the earth's surface. They are typically marked with a symbol, such as a triangle or a circle, and a unique identification code, such as A950 in this case.
Bench marks are similar to trigonometrical stations, but they are used to mark the elevation of a point on the ground, rather than its location. Spot heights are used to indicate the elevation of a particular point on a map, but they are not physical markers on the ground. Beacons are used for navigation and are typically tall structures used as landmarks to help travelers determine their location.
The symbol A950 to the north-east of IREWA is