IEEE 802.11
The first Wi-Fi standard was made in 1997.  It is called IEEE 802.11.  It allows communication with 1-2 MBit per second.  Today it is outdated, and rare.  Later standards add a letter to the name.  They are labelled IEEE  802.11a to IEEE 802.11g.  There are plans for ones labeled h, i, j, n, p and s.  They are all compatible with each other.