The second one, it should be the one that is opening left with a line underneath, the images are unclear but that’s the most likely correct answer !
        
             
        
        
        
The capital letter W is expressed as U+0057 in Unicode system
- The Unicode system is known as a type of coding system which contains worldwide character encoding standard that gives a code to every character and symbol in every language spoken in the world today. 
- It is known as the encoding standard that is used in all languages, It makes sure that an individual can retrieve or combine data with the use of different languages altogether.
Conclusively, we can say that the The capital letter W is expressed as U+0057 in Unicode system
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The acronym RFID (Radio Frequency Identification) describes
networked devices that contain microcomputers but are not thought of as
computing devices, such as refrigerators, automobile components, light
bulbs, and industrial control devices. RFIDs are  battery-powered sensors that gather and transmit data to a reading device. Some sensor based technologies are  scanning electron microscopes, LiDAR,radar, GPS, x-ray, sonar, infrared and seismic.
        
             
        
        
        
If you mean sonar it uses echolocation but GPS is signaled from satellite to the internal antenna