802.16d
Strictly speaking, 802.16d has never existed as a standard. The standard is correctly called 802.16-2004 and was developed by the IEEE 802.16 Task Group d. Therefore the project was called 802.16d, but the standard never was. However, since this standard is frequently called 802.16d, that term is also used in this article to assist readability.
802.16e
Just as 802.16d has never existed, neither has 802.16e. 802.16e is an amendment to 802.16-2004, and the amendment is properly referred to as 802.16e-2005. 802.16e-2005 is not a standard in its own right - since it is only an amendment, the original document (802.16-2004) has to be read and then the amendments added to it.
Fixed WiMAX
This is a phrase frequently used to refer to systems built using 802.16-2004 ('802.16d') and the OFDM PHY as the air interface technology.
Fixed WiMAX deployments do not cater for handoff between Base Stations, therefore the service provider cannot offer mobility.
Mobile WiMAX
A phrase frequently used to refer to systems built using 802.16e-2005 and the OFDMA PHY as the air interface technology. "Mobile WiMAX" implementations can be used to deliver both fixed and mobile services.
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