How to abbreviate Observation Balloon?

The ways to abbreviate Observation Balloon.

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OB:
Observation Balloon
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APASmart Define. (2017). observation balloon. Retrieved September 21, 2026, from http://smartdefine.org/observation_balloon/abbreviations/a
ChicagoSmart Define. 2017. "observation balloon" http://smartdefine.org/observation_balloon/abbreviations/a (accessed September 21, 2026).
HarvardSmart Define 2017, observation balloon, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/observation_balloon/abbreviations/a>.
MLASmart Define. "observation balloon" 16 June 2017. Web. 21 September 2026. <http://smartdefine.org/observation_balloon/abbreviations/a>