iccs: The image cheque clearance system.

inw: inward.

clg: clearing.
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P. (15)

https://www.amf.org.ae/sites/default/files/econ/amdb/[vocab]...
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Inward Clearing Inward clearing means all those cheques which are issued by account holders to other parties and now these cheques are presented for payment (in term of amount of cheque credit to presenter account).

https://www.coursehero.com/file/p71iscn/Inward-Clearing-Inwa...
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والله أعلم