There are 2 definitions of Ob in English:

Ob1

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The principal river of the western Siberian lowlands and one of the largest rivers in Russia. Rising in the Altai Mountains, it flows generally north and west for 5,410 km (3,481 miles) before entering the Gulf of Ob (or Ob Bay), an inlet of the Kara Sea, a part of the Arctic Ocean.

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Word of the day semblance
Pronunciation: ˈsɛmbləns
noun
the outward appearance or apparent form of something…

There are 2 definitions of Ob in English:

OB2

Line breaks: OB

abbreviation

British
Outside broadcast.