Proper noun
Initialism of People's Own Savings Bank.
Initialism of Post Office Savings Bank.
Source: en.wiktionary.orgAfter failing to access their pensions at the POSB branches in Harare, hundreds of people, most of them elderly told the ZBC News that they had no money to go back… Source: Internet
Non branded cards of POSB and Maybank local ATM Cards are kept without a chip but have a Plus or Maestro sign which can be used to withdraw cash locally or overseas. Source: Internet