Is the ICV the same thing as the authtag? (rhetorical question, I looked at the code: yes it is) I've never seen the authtag/mac for aes-gcm referred to as ICV

Is the ICV the same thing as the authtag? (rhetorical question, I looked at the code: yes it is) I've never seen the authtag/mac for aes-gcm referred to as ICV -- any context on why it's used here? is it a more general term cryptographers use, or is it the new way (or old way) to refer to authtags ? wrt IV reuse the protocol doc says the NICs use a picosecond timestamp counter -- do NICs really have picosecond resolution clocks, or is it nanoseconds + monotonically increasing counter within the nanosecond?