What is did that?

"DID" can refer to multiple things, so it's important to know the context in which it's being used. Here are a few possibilities:

1. Dissociative Identity Disorder (DID) - This is a mental health disorder where a person experiences two or more distinct identities or personalities. It used to be called "multiple personality disorder." Some of the common symptoms of DID include memory lapses, feeling detached from one's self, and experiencing amnesia.

2. Direct Inward Dialing (DID) - This is a telephony feature that allows phone numbers to be assigned directly to specific extensions or lines within a larger phone system. For example, a company may have a main phone number, but each employee may have their own DID that goes directly to their desk instead of going through the main operator.

3. Dynamic Infrared Thermography (DIT) - This is a method used in non-destructive testing to detect flaws or anomalies in materials or structures. DIT involves heating up the object with an external heat source and then measuring how quickly different parts of the object cool down to detect variations in thermal conductivity. It's often used in fields like aerospace engineering or materials science.