How many types of IND does FDA have?

There are two IND categories: Commercial and Research (non-commercial).
There are three IND types:
An Investigator IND is submitted by a physician who both initiates and conducts an investigation, and under whose immediate direction the investigational drug is administered or dispensed.  A physician might submit a research IND to propose studying an unapproved drug, or an approved product for a new indication or in a new patient population.
Emergency Use IND  allows the FDA to authorize use of an experimental drug in an emergency situation that does not allow time for submission of an IND in accordance with  21CFR , Sec. 312.23 or Sec. 312.20.  It is also used for patients who do not meet the criteria of an existing study protocol, or if an approved study protocol does not exist.
Treatment IND is submitted for experimental drugs showing promise in clinical testing for serious or immediately life-threatening conditions while the final clinical work is conducted and the FDA review takes place.