"Bloomberg" means that the information in the post was reported by Bloomberg, a major global financial news and media organization. In this context, it indicates the post is citing Bloomberg as the source for the update about the US, Iran, Oman, the Strait of Hormuz, and the market reaction in oil prices and equities.

Put simply, Bloomberg is a well-known outlet that covers business, markets, economics, politics, and international affairs, so mentioning it here signals that the post is relying on a professional news source rather than presenting the information as original reporting.