802.11ac-class device wireless speeds are often advertised as AC followed by a number, that number being the highest link rates in Mbit/s of all the simultaneously-usable radios in the device added up.
This page provides a breakdown of the WLAN 802.11ac data rates. The following table outlines the 802.11ac data rates for 20MHz, 40MHz, 80MHz, and 160 MHz bandwidths across various modulation and coding schemes (MCS).
Similarly, 802.11ac technology uses 433Mbps per spatial stream (in the 5GHz band), so 802.11ac theoretical maximum speeds are 433Mbps, 866 Mbps, etc., in multiples of 433.