The charges reflecting in your statement as 'SMAB' is Monthly Average Balance.
Your account status has been converted to ‘General Savings Account’, as your salary has not been credited into the account for a period of 3 months and more.
For ‘General Savings Account’ the MAB to be maintained is Rs. 10,000.
You may visit our website www.icicibank.com > Service Charges and Fees (Bottom of the page) > Personal Banking > Savings Account.