It stands for initial margin; the cash (broadly, monetary assets) which a futures trader has to deposit in a margin...

The cash which a futures trader has to deposit in a margin account as security for guaranteeing a contract fulfillment at...

The cash which a futures trader has to deposit in a margin account as security for guaranteeing a contract fulfillment at...

The cash which a futures trader has to deposit in a margin account as security for guaranteeing a contract fulfillment at...