CW9166 and Catalyst 9166 are the same thing. CW simply stands for Catalyst Wireless. CW9166 as it self is a general term that people tend to use. CW9166I is an AP with Internal omni-directional Antennas, not unlike 2802i, 3702i, etc. A CW9166I-MR indicates a 9166I AP in Meraki Persona, i.e. one that is fully managed in the Meraki Dashboard, just like an MR33 etc. CW9166D1 is an AP with internal directional antennas. Note that there is a difference between omni-directional and directional antennas. All Meraki APs that start with MR, e.g. MR33, MR36, MR46E, etc are Meraki native Access Points. All APs with CW, e.g. CW9162, CW9164 are dual-mode APs which can be in either Catalyst persona or Meraki persona, and may be converted back and forth. All APs with C, e.g. C9120, C9130, C9136 etc are Catalyst only APs, meaning they can not be managed byt the Meraki Dashboard, and thus requires a Wireless Controller.
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