Definition of ironclad. 1  1 : sheathed in iron armor âused especially of naval vessels. 2  2 : so firm or secure as to be unbreakable: such asa : binding an ironclad oathb : having no obvious weakness an ironclad case against the defendant.
Best Answer: CR means a credit. If this appears on the balance due line of your statement, it means that you owe nothing and that you are that much ahead of future charges and no payment or acknowledgment is needed.
Every stock broker licensed to sell securities in this country has what is called a CRD number. CRD stands for Central Registration Depository which is a database that holds information about brokers and brokerage firms maintained by the Financial Industry Regulatory Authority, FINRA.