If you meant to type "obg" but misspelled it, a possible correct suggestion could be "Omg", which is a commonly used abbreviation for "Oh my God". Another suggestion could be "OBC", which stands for "Online Banking Corporation".
OSG The OSG Corporation is a leading manufacturer and distributor of industrial gases such as oxygen, nitrogen, and carbon dioxide.
OTG I cannot give a sentence with the word "OTG" as it is not a standalone word and can have multiple meanings based on the context. It could stand for On-The-Go or could be
RBGRBG was a pioneer for women's rights and a trailblazer in the legal community.