What does INDIGO BLUE stand for?

The list of INDIGO BLUE abbreviation meanings.

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1
Indigo(Call Sign, Airline)
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APASmart Define. (2018). indigo blue. Retrieved September 29, 2026, from http://smartdefine.org/indigo_blue/abbreviations/f/call_sign
ChicagoSmart Define. 2018. "indigo blue" http://smartdefine.org/indigo_blue/abbreviations/f/call_sign (accessed September 29, 2026).
HarvardSmart Define 2018, indigo blue, Smart Define, viewed 29 September, 2026, <http://smartdefine.org/indigo_blue/abbreviations/f/call_sign>.
MLASmart Define. "indigo blue" 15 February 2018. Web. 29 September 2026. <http://smartdefine.org/indigo_blue/abbreviations/f/call_sign>