RENMINBI, YUAN The renminbi (literally people's currency) is the legal tender in the mainland of the People's Republic of China. It is issued by the People's Bank of China (PBOC, central bank). The official abbreviation is CNY, although also commonly abbreviated as RMB.
You can come to the UK with a Tier 2 (General) visa for a maximum of 5 years and 14 days, or the time given on your certificate of sponsorship plus 1 month, whichever is shorter.
This article talks about B-2 Visiting visa - US Visiting visa. If you want to get your family members or relatives for your gradwalk, you need to apply for B-2 Visa. To Obtain B-2 Visa, you need to go through same process of Filling DS-160 form, Visa Interview as you did for F1 Visa.