“Typical” – Is used for parameters that are not verified, except for some limited testing during product development. It means that the product should perform this way, but we do not have a way to guarantee it. In math, "typical" is often a key word for “mean” or “average” value. Since the mean is a measure of central tendency it is informally thought to represent the typical value among the values in a list.
A good example of a "typical" designation would be scan speed on a data acquisition product. We can state a "typical" scan rate, but it may rely on an outside influence like processor speed, network speed, and other environmental conditions as well as what you are reading.
If you scanned multiple times over and recorded the rate then took the average, it would give you a good "typical" rate.
The word "typical" is also found in some specification tables, generally as a footnote. Here is a relative specification of the 200 mAmp AC Current range of a meter: (this one is the 8508A)
Here are the relative specs:
These specs come with the following footnote:
[9] Typical below 10 Hz for ACV, below 10 Hz and above 10 kHz for ACI.
What this is telling us is that the uncertainty table only indicates a "typical" value if above 10KHz for AC Current (ACI). So the last listing, while it would apply up to 10KHz, may or may not apply above that value. With the testing that was in the design and testing groups' control - the frequency values outside the specified value (greater than 10K) probably averaged 600PPM of reading and 100PPM of range on the 90-day and 1 year interval, but an unknown limitation made an explicit guarantee impossible.