Sorry, no online dictionaries contain the exact phrase signal operators.
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Reverse dictionary results:
1. qst
2. carrier
3. alarum
4. bridge
5. tsos
6. annunciator
7. arm
8. assembly
9. axon
10. beam
11. beckon
12. beckoning
13. black flag
14. cable
15. channel
16. chime
17. chiming
18. clear
19. collar
20. command
21. communication
22. demodulate
23. dial
24. ensign
25. flagged
26. frequency modulation
27. gain
28. gee
29. gesture
30. glower
31. gong
32. highball
33. index
34. indicator
35. lighthouse
36. mark
37. modulation
38. motion
39. neuron
40. output

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